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

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Flow chart of inclusion/exclusion criteria and patient groups. Subgroups of the lowest tier in the flow chart were analysed collectively as non-NPS users. CAMHS, Child and Adolescent Mental Health Services; ECT, electroconvulsive therapy; NPS, novel psychoactive substance; REH, Royal Edinburgh Hospital.