1. Department of Internal Medicine, National Taiwan University College of Medicine, Taipei, Taiwan
2. Institute of Epidemiology and Preventive Medicine, National Taiwan University College of Public Health, Taipei, Taiwan
3. Graduate Institute of Clinical Medicine, National Taiwan University College of Medicine, Taipei, Taiwan
4. Department of Integrated Diagnostics and Therapeutics, National Taiwan University Hospital, Taipei, Taiwan
5. Department of Medicine, Michael E. DeBakey VA Medical Center, and Baylor College of Medicine, Houston, TX, USA