1. Department of Internal Medicine, Haeundae Bumin Hospital, Busan, Korea
2. Kohwang Medical Research Institute, Kyung Hee University School of Medicine, Seoul, Korea
3. Department of Otolaryngology, Inje University, Busan, Korea
4. Department of General Surgery, Inje University, Busan, Korea
5. Division of Nephrology, Department of Internal Medicine, Kyung Hee University, Seoul, Korea
6. Division of Nephrology, Department of Internal Medicine, Inje University, Busan, Korea