1. Department of Radiology, cDivision of Cardiology, Department of Internal Medicine, Faculty of Medicine, Chulalongkorn University, Bangkok 10330; Thailand
2. Department of Radiology, King Chulalongkorn Memorial Hospital, Thai Red Cross Society, Bangkok 10330, Thailand
3. Department of Radiology, Faculty of Medicine, Chulalongkorn University, Bangkok 10330; Thailand