1. Department of Microbiology; Faculty of Medicine; Khon Kaen University; Thailand
2. Department of Otorhinolaryngology; Faculty of Medicine; Khon Kaen University; Thailand
3. Faculty of Public Health; Ubon Ratchathani Rajabhat University; Ubon Ratchathani Thailand
4. Department of Epidemiology; Faculty of Public Health; Khon Kaen University; Khon Kaen Thailand
5. Department of Pharmacology; Faculty of Medicine; Khon Kaen University; Khon Kaen Thailand