1. Department of Internal Medicine, Busan Hangun Hospital, Busan, Korea
2. Department of Internal Medicine, Inje University College of Medicine, Busan, Korea
3. Department of Internal Medicine, Pusan National University School of Medicine, Busan, Korea
4. Department of Internal Medicine, Kosin University Gospel Hospital, Busan, Korea
5. Department of Internal Medicine, Dong-A University College of Medicine, Busan, Korea
6. Department of Internal Medicine, Good Samsun Hospital, Busan, Korea
7. Department of Internal Medicine, Maryknoll Medical Center, Busan, Korea