Affiliation: | 1. Department of Microbiology, Faculty of Medicine, Chiang Mai University, Chiang Mai, Thailand;2. Research Institute for Health Sciences, Chiang Mai University, Chiang Mai, Thailand;3. Department of Internal Medicine, Faculty of Medicine, Chiang Mai University, Chiang Mai, Thailand;4. Department of Epidemiology, Bloomberg School of Public Health, Johns Hopkins University, Baltimore, Maryland |