1. Harvard Medical School, Boston, Massachusetts.
2. Department of Immunology and Infectious Diseases, Harvard School of Public Health, Boston, Massachusetts.
3. Institut de Recherche pour le Développement, URI 174, Chiang Mai, Thailand.
4. Department of Pediatrics, Children's Hospital, Boston, Massachusetts.
5. Bhumibol Adulyadej Hospital, Bangkok, Thailand.
6. Regional Hospital, Hat Yai, Thailand.
7. Mae Chan Hospital, Chiang Rai, Thailand.
8. Phan Hospital, Chiang Rai, Thailand.