1Department of Internal Medicine, Pusan National University Hospital, Pusan National University School of Medicine, Busan, Korea.
2Biomedical Research Institute, Pusan National University Hospital, Busan, Korea.
3Department of Internal Medicine, Inje University Haeundae Paik Hospital, Inje University College of Medicine, Busan, Korea.
4Department of Internal Medicine, Inje University Busan Paik Hospital, Inje University College of Medicine, Busan, Korea.
5Department of Internal Medicine, Busan St. Mary's Hospital, Catholic University of Pusan, Busan, Korea.
6Department of Internal Medicine, Ulsan University Hospital, University of Ulsan College of Medicine, Ulsan, Korea.
7Department of Internal Medicine, Daedong Hospital, Busan, Korea.
8Department of Internal Medicine, Kosin University Gospel Hospital, Kosin University College of Medicine, Busan, Korea.
9Department of Internal Medicine, Dong-A Medical Center, Dong-A University College of Medicine, Busan, Korea.
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