1. Department of Microbiology Faculty of Medicine Siriraj Hospital Mahidol University Bangkok Thailand
2. Department of Surgery Faculty of Medicine Khon Kaen University Khon Kaen Thailand
3. Division of Cardiology Department of Medicine Faculty of Medicine Siriraj Hospital Mahidol University Bangkok Thailand
4. Division of Cardiovascular Thoracic Surgery Department of Surgery Faculty of Medicine Siriraj Hospital Mahidol University Bangkok Thailand