1. Department of Urology, Ulsan University Hospital, University of Ulsan College of Medicine, Ulsan, Korea.
2. Basic-Clinical Convergence Research Center, University of Ulsan, Ulsan, Korea.
3. Department of Biostatistics, Korea University College of Medicine, Seoul, Korea.
4. Department of Internal Medicine, Ulsan University Hospital, University of Ulsan College of Medicine, Ulsan, Korea.