[1] Univ Republica, Ctr Hosp Pereira Rossell, Dept Neonatol, Bulevar Gen Artigas 1550, Montevideo, Uruguay
[2] Pontificia Univ Catolica Chile, Fac Med, Dept Neonatol, Santiago, Chile
[3] Pontificia Univ Catolica Chile, Fac Med, Dept Salud Publ, Santiago, Chile
[4] Hosp Italiano Buenos Aires, Dept Neonatol, Buenos Aires, DF, Argentina
[5] Clin & Maternidad Suizo Argentina, Buenos Aires, DF, Argentina
[6] Hosp Italiano Buenos Aires, Buenos Aires, DF, Argentina
[7] Hosp Juan Fernandez, Buenos Aires, DF, Argentina
[8] Hosp Lagomaggiore, Mendoza, Argentina
[9] Maternidad Sarda, Buenos Aires, DF, Argentina
[10] Sanat Trinidad, Buenos Aires, DF, Argentina
[11] Hosp Espanol Mendoza, Mendoza, Argentina
[12] Hosp Univ Austral, Buenos Aires, DF, Argentina
[13] Hosp Nuestra Senora Misericordia, Cordoba, Argentina
[14] Hosp Univ UFMA, Sao Luis, Brazil
[15] Hosp Clin Univ Catolica Chile, Santiago, Chile
[16] Hosp Clin Univ Chile, Santiago, Chile
[17] Hosp Guillermo Grant, Concepcion, Chile
[18] Hosp Gustavo Fricke, Villa Del Mar, Chile
[19] Hosp San Jose, Santiago, Chile
[20] Hosp Dr Sotero del Rio, Santiago, Chile
[21] Hosp San Borja Arriaran, Santiago, Chile
[22] Hosp Puerto Montt, Puerto Montt, Chile
[23] Hosp Van Buren, Valparaiso, Chile
[24] Hosp Antofagasta, Antofagasta, Chile
[25] Dept Hosp Clin Asuncion, Asuncion, Paraguay
[26] Hosp San Pablo, Asuncion, Paraguay
[27] Hosp Cayetano Heredia, Lima, Peru
[28] Hosp Guillermo Almenara, Lima, Peru
[29] Serv Recien Nacidos Pereira Rossell, Fac Med, Montevideo, Uruguay
[30] Pontificia Univ Catolica, Unidad Base Datos, Santiago, Chile