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    • Dormitzer, Catherine M.; Gonzalez, Gonzalo B.; Penna, Marcel; Bejarano, Julio; Obando, Patricia; Sanchez, Mauricio; Vittetoe, Kenneth; Gutierrez, Ulises; Alfaro, Juan; Meneses, Guillermo; Bolivar Diaz, Jorge; Herrera, Manuel; Hasbun, Julia; Chisman, Anna; Caris, Luis; León C., Paulo C. (Pan American Health Organization, 2004)
      Objective. To estimate the occurrence and school-level clustering of drug involvement among school-attending adolescent youths in each of seven countries in Latin America, drawing upon evidence from the PACARDO research ...