1. Department of Pathology; Faculty of Medicine; Prince of Songkla University; Hat Yai Songkhla Thailand
2. Sappasitthiprasong Medical Center; Ubon Ratchathani Thailand
3. Bureau of Epidemiology; Department of Disease Control; Ministry of Public Health; Nonthaburi Thailand
4. Department of Medicine; Faculty of Medicine; Prince of Songkla University; Hat Yai Songkhla Thailand