1. Department of Epidemiologic and Psychosocial Research, National Institute of Psychiatry Ramon de la Fuente Muñiz, Mexico City, Mexico
2. Nursing Department, Hospital General Regional No. 2 “Guillermo Fajardo Ortiz,” Mexican Institute of Social Security, Mexico City, Mexico
3. Doctorate Program in Medical, Odontology and Health Sciences of the National Autonomous University of Mexico, Mexico City, Mexico
4. Doctorate Program in Psychology of the National Autonomous University of Mexico, Mexico City, Mexico
5. Master Program in Addictive Behaviours of the National Autonomous University of Mexico, Mexico City, Mexico