1. National Institute of Health, Department of Medical Sciences, Ministry of Public Health, Nonthaburi, Thailand
2. Regional Medical Sciences Center 6 Chonburi, Department of Medical Sciences, Ministry of Public Health, Chonburi, Thailand
3. Rayong Hospital, Ministry of Public Health, Rayong, Thailand
4. Medical Sciences Technical Office, Department of Medical Sciences, Ministry of Public Health, Nonthaburi, Thailand