1. Department of Biotechnology, Faculty of Science and Technology, Thammasat University (Rangsit Center), Pathum Thani 12120, Thailand
2. Department of Microbiology, Faculty of Medicine, Shimane University, Shimane 693-8501, Japan
3. Department of Microbiology, Faculty of Medicine, Khon Kaen University, Khon Kaen 40002, Thailand
4. HPV & EBV and Carcinogenesis Research Group, Khon Kaen University, Khon Kaen 40002, Thailand