Validation of self-reported cannabis dose and potency: an ecological study.
van der Pol, Peggy 1; Liebregts, Nienke 2; de Graaf, Ron 1; Korf, Dirk J. 2; van den Brink, Wim 3; van Laar, Margriet 1
[Report] Addiction. 108(10):1801-1808, October 2013.

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