[1] Interamer Dev Bank, Div Social Protect & Hlth, Jamaica Country Off 6 Montrose Rd, Kingston 6, Jamaica
[2] Inst Mexicano Seguro Social, Unidad Invest Epidemiol & Serv Salud, Ctr Med Nacl Siglo XXI, Mexico City, DF, Mexico
[3] Univ Nacl Autonoma Mexico, Ctr Invest Polit Poblac & Salud, Mexico City, DF, Mexico
[4] Soc Mexicana Calidad Salud, Mexico City, DF, Mexico
[5] Alianza Med Salud AC, Mexico City, DF, Mexico
[6] Inst Nacl Cardiol Ignacio Chavez, Mexico City, DF, Mexico