1. Department of Endocrinology and Metabolism, Ajou University School of Medicine, Suwon, Korea.
2. Department of Nephrology, Ajou University School of Medicine, Suwon, Korea.
3. Department of Urology, Ajou University School of Medicine, Suwon, Korea.
4. Department of Pathology, Ajou University School of Medicine, Suwon, Korea.