Funding source: Italian Department of Antidrug policies
Award Identifier / Grant number: no number
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Research funding: The study is partially funded by the project “Implementation of the identification and study of the effects of NPS: Development of a multicenter research to enhance the database of the National drug Addiction Observatory and the Early Warning System” and by the project “National Early Warning System on Drugs (SNAP)” following the Italian Department of Antidrug policies.
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Author contributions: All authors have accepted responsibility for the entire content of this manuscript and approved its submission.
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Competing interests: Authors state no conflict of interest.
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Informed consent: Not applicable.
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Ethical approval: Not applicable.
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