1. Influenza Division, Centers for Disease Control and Prevention, Atlanta, GA, USA
2. Queen Sirikit National Institute of Child Health, Thailand Ministry of Public Health, Bangkok, Thailand
3. U.S. Naval Medical Research Unit No. 6, Bellavista, Peru
4. Lata Medical Research Foundation, Nagpur, India
5. Abt Associates, Atlanta, GA, USA
6. Thailand Ministry of Public Health - US Centers for Disease Control and Prevention Collaboration, Nonthaburi, Thailand
7. Rajavithi Hospital, Thailand Ministry of Public Health, Bangkok, Thailand
8. Datta Meghe Institute of Medical Sciences, Sawangi, India
9. Instituto Nacional Materno Perinatal, Lima, Peru
10. Hospital Nacional Docente Madre Niño San Bartolomé, Lima, Peru
11. Hospital Nacional Arzobispo Loayza, Lima, Peru
12. Daga Memorial Government Women Hospital, Nagpur, India
13. Nopparat Rajathanee Hospital, Thailand Ministry of Public Health, Bangkok, Thailand