1. Cardiac Electrophysiology Research and Training Center, Chiang Mai University, Chiang Mai 50200, Thailand
2. Department of Immunology, Faculty of Medicine Siriraj Hospital, Mahidol University, Bangkok 10700, Thailand
3. Vichaiyut Hospital, Bangkok 10400, Thailand
4. Division of Cardiology, Rajavithi Hospital, College of Medicine, Rangsit University, Bangkok 10400, Thailand
5. Intermountain Heart Institute, Utah Valley Hospital, Provo, UT 84604, USA