[1] Univ Calif Los Angeles UCLA, Ctr Social Med, Los Angeles, CA 90024 USA
[2] Univ Calif San Diego UCSD, Dept Family & Prevent Med, La Jolla, CA USA
[3] Prevencasa AC, Tijuana, Mexico
[4] UCSD, Div Infect Dis & Global Publ Hlth, La Jolla, CA USA
[5] Univ Nacl Autonoma Mexico, Dept Psychol, Mexico City, DF, Mexico
[6] Colegio Frontera Norte, Tijuana, Baja California, Mexico
[7] Univ Xochicalco, Mexicali, Baja California, Mexico
[8] UCSD, La Jolla, CA USA