Evaluating the drug use "gateway" theory using cross-national data: consistency and associations of the order of initiation of drug use among participants in the WHO World Mental Health Surveys
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author: Louisa Degenhardt, María Elena Medina-Mora Icaza, Nancy A Sampson, Jordi Alonso, Matthias C Angermeyer, Ronny Bruffaerts, Giovanni de Girolamo, Ron de Graaf, Oye Gureje, Sing Lee, Daphna Levinson, Dan J. Stein, Elisabeth Wells, Ronald C. Kessler, José Posada-Villa, Aimee N Karam, Wai Tat Chiu, Stanislav Kostyuchenko, Yehuda Neumark, Yosikazu Nakamura, Lisa Dierker
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