[1] Univ OHiggins, Inst Ciencias Salud, Rancagua, Chile
[2] Univ Nacl Cordoba, Escuela Salud Publ, Fac Ciencias Med, Cordoba, Argentina
[3] Univ Chile, Fac Med, Santiago, Chile
[4] Univ Alabama Birmingham, Dept Epidemiol, Birmingham, AL USA
[5] Univ Sierra Sur, Div Estudios Posgrad, Consejo Nacl Ciencia & Tecnol, Oaxaca, Oaxaca, Mexico
[6] Columbia Univ, Dept Epidemiol, New York, NY USA
[7] New York State Psychiat Inst & Hosp, Div Hlth Policy & Behav Sci, New York, NY 10032 USA