1. Department of Internal Medicine, Kyung Hee University College of Medicine, Seoul, Korea.
2. Department of Medicine, Graduate School, Kyung Hee University, Seoul, Korea.
3. Department of Internal Medicine, Hanyang University Seoul Hospital, Hanyang University College of Medicine, Seoul, Korea.
4. Department of Internal Medicine, Chonnam National University Hospital, Chonnam National University, Gwangju, Korea.
5. Department of Pediatrics, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea.
6. Department of Internal and Cardiovascular Medicine, Tarumizu Chuo Hospital, Kagoshima, Japan.
7. Waon Therapy Research Institute, Tokyo, Japan.
8. Department of Cardiology, Dokkyo Medical University, Tochigi, Japan.