[1] Hosp Cent, Inst Previs Social, Asuncion, Paraguay
[2] Univ San Ignacio Loyola, Ctr Estudios Econ & Sociales Salud, Lima, Peru
[3] Inst Invest Sanit Aragon, Zaragoza, Spain
[4] Univ Peruana Cayetano Heredia, Ctr Salud Global, Lima, Peru
[5] Univ Zaragoza, Fac Med, Dept Obstet & Ginecol, Zaragoza, Spain
[6] Maastricht Univ, Sch Oncol & Dev Biol, Maastricht, Netherlands
[7] Univ Catolica Santiago Guayaquil, Fac Ciencias Med, Inst Invest & Innovac Salud Integral, Guayaquil, Ecuador
[8] Univ Catolica Nuestra Senora Asuncion, Fac Ciencias Salud, Asuncion, Paraguay