1. Department of Internal Medicine, Inha University School of Medicine, Incheon, Korea.
2. Department of Internal Medicine, Ajou University School of Medicine, Suwon, Korea.
3. Department of Internal Medicine, University of Ulsan College of Medicine, Seoul, Korea.
4. Department of Internal Medicine, Kosin University College of Medicine, Busan, Korea.
5. Department of Internal Medicine, Hallym University College of Medicine, Chuncheon, Korea.
6. Department of Pediatrics, National Health Insurance Corporation Ilsan Hospital, Goyang, Korea.
7. Department of Internal Medicine, Chungbuk National University College of Medicine, Cheongju, Korea.
8. Department of Internal Medicine, Korea University College of Medicine, Seoul, Korea.
9. Department of Internal Medicine, Chonnam National University Medical School, Gwangju, Korea.
10. Department of Internal Medicine, Dongguk University Ilsan Hospital, Goyang, Korea.