[1] Pfizer Global Res & Dev, 50 Pequot Ave,MS6025-C2173, New London, CT 06320 USA
[2] Maya Family Med Ctr, Chicago, IL USA
[3] Hosp Nacl Ninos Dr Carlos Saenz Herrera, San Jose, Costa Rica
[4] Neeman ICIC, San Jose, Costa Rica
[5] Hosp Infantil Juan Pablo II, Guatemala City, Guatemala
[6] Childrens Hosp Orange Cty, Orange, CA USA
[7] Pediat Plus, Clovis, CA USA
[8] Childrens Hosp & Hlth Ctr, San Diego, CA USA
[9] Scottsdale Pediat Ctr, Scottsdale, AZ USA
[10] Primary Phys Res, Pittsburgh, PA USA
[11] Allegheny Singer Res Inst, Ctr Genom Sci, Pittsburgh, PA 15212 USA
[12] MCP Hahnemann Sch Med, Dept Microbiol & Immunol, Pittsburgh, PA USA
[13] Vienna Pediat Associates, Vienna, VA USA
[14] Univ Chile, Sch Med, Clin Res Grp, Santiago, Chile
[15] Ctr Med OTOMED, Santiago, Chile
[16] Univ Chile, Hosp Clin, Santiago, Chile
[17] Hosp Ninos Luis Calvo Mackenna, Santiago, Chile
[18] Hill Top Res Inc, Salt Lake City, UT USA
[19] Univ N Texas, Hlth Sci Ctr, Dept Pediat, Ft Worth, TX USA
[20] Rainbow Babies & Childrens Hosp, Cleveland, OH 44106 USA
[21] Pfizer Inc, New York, NY USA