[1] Inst Nacl Enfermedades Resp, Mexico City, DF, Mexico
[2] NIAID, NIH, 9000 Rockville Pike, Bethesda, MD 20892 USA
[3] Westat Corp, Rockville, MD USA
[4] Leidos Biomed, Bethesda, MD USA
[5] Inst Nacl Ciencias Med & Nutr Salvador Zubiran, Mexico City, DF, Mexico
[6] Inst Nacl Pediat, Mexico City, DF, Mexico
[7] Hosp Infantil Mexico Dr Federico Gomez, Mexico City, DF, Mexico
[8] Hosp Gen & Alta Especialidad Dr Manuel Gea Gonzal, Mexico City, DF, Mexico
[9] Univ Autonoma San Luis Potosi, Hosp Cent Dr Ignacio Morones Prieto, San Luis Potosi, Mexico