1. Department of Internal Medicine, Dong-A University College of Medicine, Busan, Korea.
2. Department of Internal Medicine, Inje University Busan Paik Hospital, Busan, Korea.
3. Department of Internal Medicine, Pusan National University Yangsan Hospital, Yangsan, Korea.
4. Department of Internal Medicine, Inje University Haeundae Paik Hospital, Busan, Korea.
5. Department of Internal Medicine, Kosin University Gospel Hospital, Busan, Korea.
6. Department of Internal Medicine, Gyeongsang National University Changwon Hospital, Changwon, Korea.
7. Department of Internal Medicine, College of Medicine, Gyeongsang National University, Jinju, Korea.
8. Department of Internal Medicine, Ulsan University College of Medicine, Ulsan, Korea.