1. Clinical and Epidemiological Research Department, Centros de Integración Juvenil, A. C, Mexico City, México
2. Institute of Psychological Research, Universidad Veracruzana, Veracruz, México
3. Psychosocial and Documentary Research Department, Centros de Integración Juvenil, A.C, México City, México
4. Centros de Integración Juvenil, México City, México