title: Comments on Hynes et al. Prevalence of Marijuana Use among University Students in Bolivia, Colombia, Ecuador and Peru. Int. J. Environ. Res. Public Health 2015, 12, 5233-5240.
abstract: We have read and analyzed the article entitled "Prevalence of marijuana use among university students in Bolivia, Colombia, Ecuador and Peru". We propose some objective points which could enhance the internal validity of the study (i.e., we suggest to report participation proportions).
authors.affiliation: Facultad de Ciencias de la Salud, Escuela de Medicina, Universidad Peruana de Ciencias Aplicadas; Alameda San Marcos Avenue, block 2, Chorrillos. Lima 09, Lima, Peru
authors.forename: Maria Claudia
authors.initials: MC
authors.lastname: Martinez-Novack
authors.affiliation: Facultad de Ciencias de la Salud, Escuela de Medicina, Universidad Peruana de Ciencias Aplicadas; Alameda San Marcos Avenue, block 2, Chorrillos. Lima 09, Lima, Peru
authors.forename: Maria Teresa
authors.initials: MT
authors.lastname: Ortiz-Ortiz
authors.affiliation: Facultad de Ciencias de la Salud, Escuela de Medicina, Universidad Peruana de Ciencias Aplicadas; Alameda San Marcos Avenue, block 2, Chorrillos. Lima 09, Lima, Peru
authors.forename: Bruno
authors.initials: B
authors.lastname: Castañeda-Carbajal
authors.affiliation: Facultad de Ciencias de la Salud, Escuela de Medicina, Universidad Peruana de Ciencias Aplicadas; Alameda San Marcos Avenue, block 2, Chorrillos. Lima 09, Lima, Peru
authors.forename: German F
authors.initials: GF
authors.lastname: Alvarado
mesh_terms: D005260:Female; D006801:Humans; D008297:Male; D008385:Marijuana Smoking / Q000453:epidemiology*
keywords: Cannabis; Latin America; epidemiology; participation rate; prevalence proportion