1. Department of Internal Medicine, Pusan National University Hospital, Busan, Korea.
2. Department of Internal Medicine, Dong-A University Hospital, Busan, Korea.
3. Department of Internal Medicine, Ulsan University Hospital, Ulsan, Korea.
4. Department of Internal Medicine, Inje University Busan Paik Hospital, Busan, Korea.
5. Department of Internal Medicine, Inje University Haeundae Paik Hospital, Busan, Korea.
6. Department of Internal Medicine, Gyeongsang National University Hospital, Jinju, Korea.
7. Department of Internal Medicine, Pusan National University Yangsan Hospital, Yangsan, Korea.
8. Research Institute for Convergence of Biomedical Science and Technology, Pusan National University Yangsan Hospital, Yangsan, Korea.