1. Department of Internal Medicine, Yeungnam University College of Medicine, Daegu, Korea.
2. Department of Internal Medicine, Chungnam University College of Medicine, Daejeon, Korea.
3. Department of Internal Medicine, Kyunghee University College of Medicine, Seoul, Korea.
4. Department of Internal Medicine, Chungbuk University College of Medicine, Cheongju, Korea.
5. Department of Internal Medicine, Chonnam University College of Medicine, Gwangju, Korea.
6. Department of Internal Medicine, Hanrim University College of Medicine, Seoul, Korea.
7. Donga University College of Medicine, Busan, Korea.