1. Department of Internal Medicine, Taoyuan General Hospital, Taoyuan County, Taiwan
2. Department of Internal Medicine, National Taiwan University Hospital, Taipei, Taiwan
3. Department of Internal Medicine, Far Eastern Memorial Hospital, Taipei, Taiwan
4. Department of Internal Medicine, National Taiwan University Hospital Hsin-Chu Branch, Hsin-Chu, Taiwan
5. Department of Laboratory Medicine, National Taiwan University Hospital, National Taiwan University College of Medicine, Taipei, Taiwan