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. 2017 Dec 3;7(12):e015716. doi: 10.1136/bmjopen-2016-015716

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The percentage of NPS users and non-NPS users assigned principal diagnoses in accordance with ICD-10 groups. *Denotes a statistically significant difference between NPS users and non-NPS users (χ²), P<0.001. ICD, International Statistical Classification of Diseases and Related Health Problems, Version 10; NPS, novel psychoactive substances.