1. Cardiac Electrophysiology Research and Training Center, Faculty of Medicine; Chiang Mai University; Chiang Mai Thailand
2. Cardiac Electrophysiology Unit, Department of Physiology, Faculty of Medicine; Chiang Mai University; Chiang Mai Thailand
3. Department of Pathology, Faculty of Medicine; Chiang Mai University; Chiang Mai Thailand
4. Department of Oral Biology and Diagnostic Science, Faculty of Dentistry; Chiang Mai University; Chiang Mai Thailand