[1] Hosp Ninos Dr Ricardo Gutierrez, Caba, Argentina
[2] Hosp Ninos Jesus, Madrid, Spain
[3] Hosp Nacl Ninos Dr Carlos Saenz Herrera, San Jose, Costa Rica
[4] Hosp Ninos Pereyra Rossel, Montevideo, Uruguay
[5] Inst Crianca Prof P de Alcantara HCFMUSP, Sao Paulo, Brazil
[6] Hosp Ninos Panama, Panama City, Panama
[7] Hosp Ninos Roberto Del Rio, Santiago, Chile
[8] Hosp Padre Hurtado, Santiago, Chile
[9] Hosp Ninos R Gilbert, Guayaquil, Ecuador
[10] Hosp Especialidades Ctr Med La Raza, IHSS, Tegucigalpa, Honduras
[11] Hosp Materno Infantil Vall Dhebron, Barcelona, Spain
[12] Hosp Fernando Fonseca, Lisbon, Portugal
[13] Hosp Prof A Posadas, Buenos Aires, DF, Argentina
[14] Hosp Univ Getafe, Madrid, Spain
[15] CIBER Enfermedades Resp, Madrid, Spain