[1] Tulane Sch Publ Hlth & Trop Med, Dept Epidemiol, New Orleans, LA USA
[2] Inst Efect Clin & Sanit, Buenos Aires, Argentina
[3] Consejo Nacl Invest Cient & Tecn, Ctr Res Epidemiol & Publ Hlth, Buenos Aires, Argentina
[4] WHO, Dept Sexual & Reprod Hlth, Geneva, Switzerland
[5] London Sch Hyg & Trop Med, Fac Infect & Trop Dis, Vaccine Ctr, London, England
[6] Charite, Charite Ctr Global Hlth, Berlin, Germany
[7] Univ Washington, Comparat Hlth Outcomes Policy Econ CHOICE Inst, Sch Pharm, Seattle, WA USA
[8] Univ Washington, Sch Publ Hlth, Dept Global Hlth, Seattle, WA USA
[9] Tulane Univ, Sch Publ Hlth & Trop Med, Epidemiol, 1440 Canal St,Suite 2001, New Orleans, LA 70112 USA