[1] Univ Peruana Cayetano Heredia, Lima, Peru
[2] Univ Nacl Autonoma Mexico, Mexico City, DF, Mexico
[3] Univ Barcelona, Hosp Clin Barcelona, Barcelona Ctr Int Hlth Res, ISGlobal, Barcelona, Spain
[4] Univ Texas Houston, Sch Publ Hlth, Houston, TX USA