1. Division of Cardiology, Department of Internal Medicine, Chiang Rai Prachanukroh Hospital, Chiang Rai, Thailand
2. Division of Hematology, Department of Internal Medicine, Chiang Rai Prachanukroh Hospital, Chiang Rai, Thailand
3. Division of Cardiology, Department of Internal Medicine, Faculty of Medicine, Chiang Mai University, Chiang Mai, Thailand