1. Division of Microbiology and Parasitology; School of Medical Sciences; University of Phayao; Phayao Thailand
2. HPV & EBV and Carcinogenesis Research Group; Khon Kaen University; Khon Kaen Thailand
3. Department of Microbiology; Khon Kaen University; Khon Kaen Thailand
4. Department of Medical Microbiology; Nobel College; Kathmandu Nepal