Prevalence and age of onset for drug use in seven international sites: results from the international consortium of psychiatric epidemiology
Vega, William A.; Aguilar-Gaxiola, Sergio; Andrade, Laura; Bijl, Rob; Borges, Guilherme; Caraveo-Anduaga, Jorge J.; DeWit, David J.; Heeringa, Steven G.; Kessler, Ronald C.; Kolody, Bo; Merikangas, Kathleen R.; Molnar, Beth E.; Walters, Ellen E.; Warner, Lynn A.; Hans-Ulrich, Wittchen (2002)