1. Departments of Internal Medicine, University of Ulsan College of Medicine and Asan Medical Center,
2. Internal Medicine, Hallym University College of Medicine,
3. Internal Medicine, Sungkyunkwan University College of Medicine,
4. Internal Medicine, Seoul National University College of Medicine,
5. Internal Medicine and Surgery, Ewha Womans University College of Medicine,
6. Internal Medicine and Surgery, Hansol Hospital, and
7. Chamshil Seoul Surgical Clinic, Seoul, Korea