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  • 1
    Online Resource
    Online Resource
    Cham :Springer International Publishing AG,
    Keywords: Exercise-Physiological aspects. ; Electronic books.
    Type of Medium: Online Resource
    Pages: 1 online resource (321 pages)
    Edition: 1st ed.
    ISBN: 9783030168186
    DDC: 612.044
    Language: English
    Note: Intro -- Preface -- Rhodes' Postulates and the Reasons Why Pediatric and Congenital Cardiologists Should Study Exercise Physiology -- Clinical Value of Cardiopulmonary Exercise Testing in Patients with CHD and Other Disorders -- Contents -- Contributors -- Part I: The Normal Cardiopulmonary Response to Exercise -- 1: Biochemistry of Exercise -- Suggested Readings -- 2: Oxygen Delivery -- Heart Rate -- Stroke Volume -- Oxygen Extraction -- Kinetics of Oxygen Delivery and Oxygen Debt -- References -- 3: Central Hemodynamics and Coronary Blood Flow During Exercise -- References -- 4: CO2 Elimination (V̇CO2) -- Tidal Volume -- Respiratory Rate -- VD/VT Ratio -- Anaerobic Threshold: Implications for CO2 Elimination (and Oxygen Delivery) -- References -- Part II: Conduct of the Cardiopulmonary Exercise Test -- 5: Laboratory Setup, Equipment, and Protocols -- Environment -- Equipment -- Protocols -- The 6-Minute Walk Test (6MWT) -- Exercise Testing with Electrocardiographic Monitoring -- Cardiopulmonary Exercise Testing (CPET) -- Other Protocols -- References -- 6: Exercise Stress Echocardiography -- Background -- Assessment of Myocardial Ischemia -- Assessment of Patients with Known or Suspected Hypertrophic Cardiomyopathy -- Assessment of Patients with Known or Suspected Pulmonary Hypertension -- Conclusions -- References -- 7: Other Modalities: Assessment of Pulmonary Response and Measurement of Cardiac Output -- Exercise Flow-Volume Loops -- Measurement of Cardiac Output -- Noninvasive Measurement of Cardiac Output: Inert Gas Rebreathing -- Invasive Measurements of Cardiac Output -- Blood Sampling During Exercise -- Exercise Oscillatory Ventilation -- References -- 8: Supervision and Safety Precautions for Exercise Testing -- References -- 9: Special Considerations for Children -- Introduction -- Pediatric Patients and Their Families. , Test Equipment -- Imaging Studies -- Conclusion -- References -- 10: Special Considerations for Adults with Congenital Heart Disease -- Introduction -- Comorbidities -- Exercise Testing -- Conclusion -- Reference -- Part III: Interpretation of the Cardiopulmonary Exercise Test -- 11: Peak Exercise Parameters -- Peak V̇O2 -- Peak Work Rate and Endurance Time -- Heart Rate -- The Oxygen Pulse (O2P) -- Respiratory Exchange Ratio (RER) -- Blood Pressure -- Arterial O2 Saturation -- Respiratory Measurements -- References -- 12: Parameters from Submaximal Exercise -- Ventilatory Anaerobic Threshold (VAT) -- V̇E/V̇CO2 Slope -- End-Tidal pCO2 -- Oxygen Uptake Efficiency Slope -- Oxygen Uptake-Work Rate Relationship: ΔV̇O2/ΔWR -- The Exercise Electrocardiogram -- References -- 13: Putting It All Together -- References -- Part IV: Prototypical Lesions -- 14: Repaired Tetralogy of Fallot -- Basic Anatomy -- Hemodynamics -- Exercise Capacity -- V˙E/V˙CO2 Slope -- Other Abnormalities -- Spirometric Abnormalities -- Boston Children's Hospital Experience -- Pulmonary Valve Replacement -- Prognostic Value of CPET Data in Tetralogy of Fallot -- Prototypical Patients -- References -- 15: Fontan Circulation -- Basic Anatomy -- Exercise Hemodynamics -- Exercise Capacity -- Other Abnormalities -- Natural History of Exercise Function in Fontan Patients -- Boston Children's Hospital Experience -- Causes of Exercise Limitation in Fontan Patients -- Cardiac Function -- The Pulmonary Vascular Bed -- Chronotropic Insufficiency -- Other Causes of Exercise Dysfunction -- Fenestration Closure -- The Fontan Circulation as a Benchmark for Other Congenital Heart Defects -- Prognostic Value of Cardiopulmonary Exercise Testing Data in Patients with Fontan Circulations -- Prototypical Patient -- References -- 16: Aortic Valve Disease -- Basic Anatomy. , Exercise Hemodynamics: Aortic Regurgitation -- Exercise Hemodynamics: Aortic Stenosis -- Exercise Function -- Clinical Implications -- Prototypical Patient -- References -- 17: Coarctation of the Aorta -- Basic Anatomy -- Hemodynamics -- Exercise Function -- Clinical Implications -- Boston Children's Hospital Experience -- Prototypical Patient -- References -- 18: Systemic Right Ventricles with a Biventricular Circulation (L-Transposition and D-Transposition After Atrial Switch Operation) -- Anatomy -- D-Looped Transposition of the Great Arteries -- L-Looped Transposition of the Great Arteries -- Hemodynamics -- Exercise Function -- Myocardial Ischemia -- Boston Children's Hospital Experience -- Prototypical Patient -- References -- 19: D-Transposition s/p Arterial Switch Operation -- Basic Anatomy -- Hemodynamics -- Exercise Function -- Myocardial Ischemia -- Boston Children's Hospital Experience -- Prototypical Patient -- References -- 20: Ebstein's Anomaly -- Basic Anatomy -- Hemodynamics -- Exercise Function -- Clinical Implications -- Boston Children's Hospital Experience -- Prototypical Patient -- References -- 21: Pulmonary Vascular Disease -- Basic Anatomy and Pathophysiology -- Hemodynamics -- Exercise Function -- Ventilatory Function -- Clinical Implications -- Prototypical Patient -- References -- 22: Exercise Testing in Pediatric Dilated Cardiomyopathy -- Pathophysiology -- Exercise Testing in Children with Dilated Cardiomyopathy -- Oxygen Consumption During Exercise -- Ventilatory Abnormalities -- Blood Pressure and Electrocardiography Response -- Cardiopulmonary Exercise Testing as a Prognostic Tool -- 6-Minute Walk Test -- Prototypical Patient -- References -- 23: Hypertrophic Cardiomyopathy -- Basic Anatomy and Physiology -- Exercise Hemodynamics in Hypertrophic Cardiomyopathy. , Clinical Value of Exercise Testing in Hypertrophic Cardiomyopathy -- Risks Associated with Exercise Testing -- Prototypical Patient -- References -- 24: Coronary Anomalies -- Basic Anatomy and Physiology -- Diagnosis of Ischemia -- Anomalous Coronary Artery Origin -- Acquired Coronary Artery Disease in Pediatrics -- Postoperative Coronary Artery Assessment After Congenital Heart Surgery -- Coronary Artery Fistulae -- References -- 25: Metabolic Disorders -- Mitochondrial Defects -- Glycogen Storage Diseases -- Prototypical Patient: Mitochondrial Defect -- Prototypical Patient: Glycogen Storage Disease -- References -- 26: Exercise Testing After Pediatric Heart Transplantation -- Pathophysiology -- Exercise Testing in Pediatric Heart Transplant Recipients -- Electrocardiography and Heart Rate Changes -- Oxygen Consumption During Exercise -- Ventilatory Response -- Prototypical Patient -- Conclusion -- References -- 27: Cardiac Rehabilitation and Exercise Training -- Components of Cardiac Rehabilitation Programs -- Barriers to Success -- Healthcare System Barriers: Referral of Appropriate Patients -- Patient- and Community-Related Factors -- Boston Children's Hospital Experience -- Cardiac Rehabilitation Experience in Madrid -- References -- 28: Summary of Lesions -- Reference -- Part V: Electrophysiologic Issues -- 29: Syncope, Orthostatic Intolerance, and Exertional Symptoms -- Exercise-Associated Syncope -- Mid-exertional Syncope -- Peri-exertional and Post-exertional Syncope -- Orthostatic Intolerance and Postural Orthostatic Tachycardia -- Boston Children's Hospital Experience and Context -- Conclusion -- References -- 30: Exercise Stress Testing: Diagnostic Utility in the Evaluation of Long QT Syndrome -- Introduction -- Genetics -- Exercise Testing and Long QT Syndrome -- Conclusion -- References -- 31: Wolff-Parkinson-White Syndrome. , Introduction -- Electrocardiogram Findings in Wolff-Parkinson-White -- Accessory Pathway Characteristics and Clinical Manifestation -- Clinical Presentation -- Risk Stratification -- Anatomic Risk -- Electrophysiologic Risk -- Exercise Testing -- Symptomatic Patients and Exercise Testing -- Conclusion -- Conclusions Include -- References -- 32: Exercise Testing in the Management of Arrhythmias -- Overview -- Evaluation of Bradycardia -- Sinus Node Dysfunction -- Atrioventricular Block -- Implantable Cardiac Defibrillators -- Evaluation of Tachycardia -- Supraventricular Arrhythmias -- Ventricular Arrhythmias -- Overview -- Isolated Ventricular Ectopy -- Idiopathic Ventricular Tachycardias -- Ventricular Arrhythmias in Congenital Heart Disease -- Catecholaminergic Polymorphic Ventricular Tachycardia -- Arrhythmogenic Cardiomyopathy -- T-Wave Alternans -- Conclusion -- References -- Part VI: Interesting/Instructive Cases -- 33: Patients with Physiologically Normal Hearts and Lungs -- Case 33.1: "Fatigue" (Normal Study) -- Case 33.2: Anxiety-Related Hyperventilation -- Case 33.3: Chronic Metabolic Alkalosis -- Case 33.4: Anemia -- Case 33.5: Mitochondrial Myopathy s/p Heart Transplant -- Case 33.6: Complete Heart Block -- Case 33.7: Obesity -- Case 33.8: An Athlete with Shortness of Breath -- Case 33.9: Athlete with Post-viral Chronic Fatigue Syndrome -- Reference -- 34: Patients with Unusual Congenital Heart Defects and/or Intracardiac Shunts -- Case 34.1: Fontan Patient with Sinus Node Dysfunction -- Case 34.2: Hypoplastic Left Heart Syndrome, s/p Fontan, and Second-Degree Heart Block -- Case 34.3: Complex/Failing Fontan -- Case 34.4: A 1.5 Ventricle Repair -- Case 34.5: Corrected Transposition with Second-Degree AV Block -- Case 34.6: l-TGA with Heart Block -- Case 34.7: d-TGA, s/p Atrial Switch, and Progressive Right Ventricular Dysfunction. , Case 34.8: Tricuspid Atresia and s/p Bidirectional Glenn Shunt.
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  • 2
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Journal of interventional cardiology 15 (2002), S. 0 
    ISSN: 1540-8183
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: The impact of device size choice on closure results was analyzed in 138 (101 females, 37 males; age 0.5–84.0 years) consecutive patients who underwent transcatheter closure of the secundum atrial septal defect (ASD) using the Amplatzer septal occluder (ASO). The balloon stretched diameter (SD) of ASD was 19.5 ± 7.2 mm in 123 patients with single defects, and 20.4 ± 6.6 mm for the largest defects in 15 patients with multiple ASDs. The difference (Δ) between ASO size chosen for closure and the stretched diameter of the defect was calculated and divided into groups: Δ (Δ〈2 mm); B (Δ-2.0 to - 0.1 mm); C(Δ=0); D (Δ 0.1–2.0 mm) and E (Δ〉2 mm). The results demonstrated that immediate and 24-hour complete closure rates were significantly higher in patients in groups C and D (P〈0.001). However, at 6-month follow-up, the complete closure rates were similar in patients of groups A-D, while patients of group E had a lower closure rate of75%. The complication rates were similar in all groups. In conclusion, a choice of a device size identical to or within 2 mm larger than the SD of the defect should be used to maximize the closure rates of ASD using the ASO.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Journal of interventional cardiology 11 (1998), S. 0 
    ISSN: 1540-8183
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Transcatheter closure of a single secundum atrial septal defect (ASD) is performed routinely using various investigational devices. A 37-year-old patient with two large secundum ASDs underwent successful simultaneous transcatheter closure using an 18-mm and 20-mm Amplatzer™ septal occluder device. At 3-month follow-up, transesophageal color Doppler echocardiography revealed one defect to be completely closed, and the other had trivial residual shunt with significant improvement in symptoms.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Journal of interventional cardiology 12 (1999), S. 0 
    ISSN: 1540-8183
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Certain types of atrial septal defects (ASDs) are amenable for transcatheter closure using various investigational devices. The use of the clamshell or buttoned devices is accompanied with a high incidence of residual shunt. The experience of ASD closure using the Amplatzer™ Septal Occluder (ASO) is limited. Therefore, the purpose of this article is to discuss the protocol of closure and report on the acute results using this device. Nineteen patients (17 ASD/2 fenestrated Fontan [FF]) underwent an attempt at catheter closure of their defects at a median age of 13.3 years (range 5.5–67.4 years) and a median weight of 49 kg (range 18–94 kg) using the ASO. The median ASD diameter measured by transesophageal echocardiography (TEE) was 12 mm (range 6–23.8 mm), and the median defect balloon stretched diameter was 17 mm (range 6–31 mm). All ASD patients had right atrial and ventricular volume overload with a mean ± SD Qp/Qs of 2.4 ± 0.9. A 7 to 8Fr catheter was used for delivery of the device in all patients. The device was placed correctly in all but one patient. There were immediate and complete closures (C) in 13 of 18 patients; 3 patients had trivial residual shunts (TS), and 2 patients had small residual shunts (SS). In the two patients with FF, oxygen saturation improved from 85% to 95% and 88% to 96%, respectively. One patient received two devices for two separate defects. The median fluoroscopy time was 15.5 minutes (range 7.4–33.4 minutes), and the median total procedural time was 78 minutes (range 52–180 minutes). There was one episode of device embolization in one patient. The device was successfully retrieved and 2 months later a second closure was performed successfully. No other complications were encountered during or after the procedure. Follow-up was performed using transthoracic echocardiography (TTE) at 1 day and 1 month and by TEE at 3 months. At day 1, there was C of the defect in 15 of 19 patients and 4 had TS; 18 patients completed 1-month follow-up, 16 of 18 had C and 2 patients had TS. Eleven patients completed 3-month follow-up, all with C. So far there have been no episodes of endocarditis, thromboembolism, or wire fracture. We conclude that the use of the new ASO is safe and effective in complete closure of atrial communications up to 23.8 mm in diameter.
    Type of Medium: Electronic Resource
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  • 5
    ISSN: 1540-8167
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Late Sudden Death Risk in Postoperative TOF. Following surgery for tetralogy of Fallot (TOP), children may develop late onset ventricular arrhythmias. Many patients have both depolarization and repolarization abnormalities, including right bundle branch block (RBBB) and QT prolongation. The goal of this study was to improve prospective risk-assessment screening for late onset sudden death. Resting ECG markers including QRS duration, QTc, JTc, and interlead QT and JT dispersion were statistically analyzed to identify those patients at risk for ventricular arrhythmias and sudden cardiac death. To determine predictive markers for future development of arrhythmia, we examined 101 resting ECGs in patients (age 12 ± 6 years) with postoperative TOF and RBBB, 14 of whom developed late ventricular tachycardia (VT) or sudden death. These ECGs were also compared with an additional control group of 1000 age- and gender-matched normal ECGs. The mean QRS (± SD) in the VT group was 0.18 ± 0.02 seconds versus 0.14 ± 0.02 seconds in the non-VT group (P 〈 0.01). QTc and JTc in the VT group was 0.53 ± 0.05 seconds and 0.33 ± 0.03 seconds compared with 0.50 ± 0.03 seconds and 0.32 ± 0.03 seconds in the non-VT group (P = NS). There was no increase in QT dispersion among TOF patients with VT or sudden death compared with control patients or TOF patients without VT, although JT dispersion was more common in the TOF groups. A prolonged QRS duration in postoperative TOF with RBBB is more predictive than QTc, JTc, or dispersion indexes for identifying vulnerability to ventricular arrhythmias in this population, while retaining high specificity. The combination of both QRS prolongation and increased JT dispersion had very good positive and negative predictive values. These results suggest that arrhythmogenesis in children following TOF surgery might involve depolarization in addition to repolarization abnormalities. Prospective identification of high-risk children may be accomplished using these ECG criteria.
    Type of Medium: Electronic Resource
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  • 6
    ISSN: 1574-695X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology , Medicine
    Notes: Abstract The pathogenicity of enterobacteria often correlates with their production of neuraminidase (sialidase). Forty-nine Helicobacter pylori isolates have therefore been examined for their production of neuraminidase and other glycosidases. All 49 isolates produced considerable neuraminidase (median 228 IU/μgmg protein, interquartile range 121–370), pH optimum 7.5. Nine of the 49 also produced fucosidase (median 23 IU/μgmg protein, interquartile range 12–39), pH optimum 7.0. Production of these enzymes did not correlate with bacterial Cag A expression or duodenal ulceration. Neutrophils exposed to neuraminidase show increased adherence to endothelium so the neuraminidase production by H. pylori could partly explain the predominant neutrophil inflammatory infiltrate seen in H. pylori-associated gastritis. Inhibition of this enzyme by use of neuraminidase-inhibitors could be a useful therapeutic approach.
    Type of Medium: Electronic Resource
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  • 7
    ISSN: 1572-8595
    Keywords: device closure ; amplatzer ; conduction ; atrial septal defect ; arrhythmias
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Conduction abnormalities and arrhythmias may occur in patients following secundum atrial septal defect (ASD) closure using the Amplatzer® septal occluder (ASO). Therefore, the aim of this study was to prospectively perform ambulatory ECG monitoring to assess the electrocardiographic effects of transcatheter closure (TCC) of ASD using the ASO device. From 5/97 to 3/99, 41 patients with secundum ASD, underwent TCC using the ASO device at a median age of 9.2[emsp4 ]y. (0.5–87[emsp4 ]y.) and median weight of 34[emsp4 ]kg (5.6–88[emsp4 ]kg.). Ambulatory Holter monitoring was performed pre- and immediately post TCC. Holter analysis included heart rate (HR), ECG intervals, supraventricular ectopy (SVE), ventricular ectopy (VE), and AV block. No change in baseline rhythm was noted in 37 patients (90%). Changes in AV conduction occurred in 3 patients (7%), including intermittent second degree AV block type II, and complete AV dissociation post closure. SVE was noted in 26 patients (63%) post closure, ranging from 5–2207 supraventricular premature beats (SVPB), including 9 patients (23%) with non-sustained supraventricular tachycardia (SVT), 3 of whom had short runs of SVT prior to closure. A significant increase in post-closure number of SVPB per hour (p=0.047) was noted. No significant difference was noted in PR interval, ventricular premature beats per hour, or QRS duration. Conclusions: Based on ambulatory ECG analysis, TCC of ASD with the ASO device is associated with an acute increase in SVE and a small risk of AV conduction abnormalities, including complete heart block. Long term follow-up studies will be necessary to determine late arrhythmia prevalence and relative frequency compared with standard surgical ASD repair.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Springer
    Annals of oncology 10 (1999), S. 118-121 
    ISSN: 1569-8041
    Keywords: CA19.9 ; CAM17.1 ; DuPan2 ; pancreas ; tumour markers ; SPan-1
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Most of the successful serological markers used in pancreatic cancer diagnosis detect circulating mucins which are back-secreted into the blood circulation. These markers have sensitivities (70-95%) and specificities (70-95%) which compare well with those achieved by imaging tests yet they have been subjected to very critical review and are still not widely used. There seem to be two main reasons for this: firstly, they are biochemical tests and clinicians tend to expect and demand 100% accuracy for such tests; secondly, the failure of serological tests to prove adequate for screening seems to have deterred clinicians from using them in more appropriate situations. It should have been realised that screening of asymptomatic cases was never going to be achievable until methods could be found for defining a high risk population. With a prevalence of about 10 per 100000, say 20 per 100000 adults, a test with 99% specificity (far in excess of that achievable by any current imaging or biochemical tests) would produce 1000 false positive results for every 20 true positives, a hopelessly unacceptable ratio. In symptomatic patients the odds are very different. The prevalence of pancreatic cancer may be as high as about 15% in patients over 40 years old who have unexplained upper abdominal pain or weight loss and in whom upper G-I endoscopy is negative. In these patients serological tests (with a false positive rate of about 15%) will fare at least as well as imaging tests. Combination of the two modalities i.e. an imaging test such as ultrasound or CT scanning together with a biochemical test such as CA19.9, DuPan2 or CAM17.1 seems both logical and highly practical and has been shown to enhance diagnostic accuracy. The best established pancreatic tumour marker assays all detect mucins. Pancreatic cancers have a particular propensity to secrete mucin into the blood either because of mechanical blockage of the pancreatic duct, loss of polarity of pancreatic cells or early blood vessel invasion. Other mucin secreting cancers e.g. colon and ovary can also cause increased concentrations of the same serological markers albeit less frequently but this is not usually a major cause of confusion since the clinical features are usually distinguishable. Serological markers correlate with tumour staging but are nevertheless still effective in resectable cancer. They may also have a useful role in monitoring after surgical resection or chemotherapy. A serological mucin assay such as CA19.9, CAM17.1, DuPan2 or SPan-1 should be used in conjunction with a scanning test in the diagnosis of patients over 40 with endoscopy-negative abdominal pain, in the investigation of patients with a known pancreatic mass or cyst, and for monitoring following resection or chemotherapy for pancreatic cancer.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Springer
    Digestive diseases and sciences 34 (1989), S. 804-804 
    ISSN: 1573-2568
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Type of Medium: Electronic Resource
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  • 10
    Publication Date: 2014-10-01
    Description: Fences that exclude alien invasive species are used to reduce predation pressure on reintroduced threatened wildlife. Planning these continuously managed systems of reserves raises an important extension of the Single Large or Several Small (SLOSS) reserve planning framework: the added complexity of ongoing management. We investigate the long-term cost-efficiency of a single large or two small predator exclusion fences in the arid Australian context of reintroducing bilbies Macrotis lagotis, and we highlight the broader significance of our results with sensitivity analysis. A single fence more frequently results in a much larger net cost than two smaller fences. We find that the cost-efficiency of two fences is robust to strong demographic and environmental uncertainty, which can help managers to mitigate the risk of incurring high costs over the entire life of the project. # doi:10.1890/13-1579.1
    Print ISSN: 1051-0761
    Electronic ISSN: 1939-5582
    Topics: Biology
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