1. Division of Infectious Diseases and Tropical Medicine, Department of Medicine, Faculty of Medicine, Chiang Mai University, Chiang Mai, Thailand
2. Division of Pulmonology and Critical Care, Department of Medicine, Faculty of Medicine, Chiang Mai University, Chiang Mai, Thailand
3. Infection Control Unit, Maharaj Nakorn Chiang Mai Hospital, Chiang Mai University, Chiang Mai, Thailand
4. Research Institute for Health Sciences, Chiang Mai University, Chiang Mai, Thailand