1. Faculty of Medicine Siriraj Hospital, Mahidol University Bangkok Thailand
2. Faculty of Medicine Chulalongkorn University Bangkok Thailand
3. King Chulalongkorn Memorial Hospital, Thai Red Cross Society Bangkok Thailand
4. Faculty of Medicine Ramathibodi Hospital, Mahidol University Bangkok Thailand
5. Chakri Naruebodindra Medical Institute Faculty of Medicine Ramathibodi Hospital, Mahidol University Bangkok Thailand
6. Department of Military and Community Medicine Phramongkutklao College of Medicine Bangkok Thailand
7. Department of Pediatrics Maharat Nakhon Ratchasima Hospital Nakhon Ratchasima Thailand
8. Department of Pediatrics, Faculty of Medicine Thammasat Hospital, Thammasat University Khlong Nueng Thailand
9. Department of Pediatrics, Faculty of Medicine Khon Kaen University Khon Kaen Thailand