1. Department of Internal Medicine, Inje University Haeundae Paik Hospital, Inje University College of Medicine, Busan, Korea.
2. Department of Internal Medicine, Pusan National University School of Medicine, Busan, Korea.
3. Department of Internal Medicine, Inje University Busan Paik Hospital, Inje University College of Medicine, Busan, Korea.
4. Department of Internal Medicine, College of Medicine, Dong-A University, Busan, Korea.
5. Department of Internal Medicine, Pusan National University Yangsan Hospital, Yangsan, Korea.
6. Department of Internal Medicine, Kosin University College of Medicine, Busan, Korea.
7. Department of Internal Medicine, Gyeongsang National University School of Medicine, Jinju, Korea.
8. Department of Pediatrics, Hanyang University Guri Hospital, Hanyang University of College of Medicine, Seoul, Korea.