1. Department of Internal Medicine, Dong-A University Hospital, Busan, Korea.
2. Department of Internal Medicine, Kangbuk Samsung Hospital, Seoul, Korea.
3. Department of Internal Medicine, Kyung Hee University East-West Neo Medical Center, Seoul, Korea.
4. Department of Internal Medicine, Chonnam National University Hospital, Gwangju, Korea.
5. Department of Internal Medicine, Chungnam National University Hospital, Daejon, Korea.
6. Department of Internal Medicine, Seoul Veterans Hospital, Seoul, Korea.
7. Department of Internal Medicine, Kyungpook National University Hopital, Daegu, Korea.
8. Department of Internal Medicine, Konkuk University Hospital, Seoul, Korea.
9. Department of Internal Medicine, Inje University Paik Hospital, Busan, Korea.
10. Department of Internal Medicine, Samsung Medical Center, Seoul, Korea.
11. Korea Food & Drug Administration, Seoul, Korea.