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BMJOPEN-2017-020737
BMJOPEN-2017-020737
http://dx.doi.org/10.1136/BMJOPEN-2017-020737
Multilevel population-based cross-sectional study examining school substance-misuse policy and the use of cannabis, mephedrone and novel psychoactive substances among students aged 11-16 years in schools in Wales.
P356
Q55314052-6F14941D-8A10-4002-9AC7-AF39C9833A08
P356
BMJOPEN-2017-020737
http://dx.doi.org/10.1136/BMJOPEN-2017-020737