1. Department of Urology, Seoul Medical Center, Seoul, Republic of Korea.
2. Department of Physiology, Chung Ang University, Seoul, Republic of Korea.
3. Department of Urology and Advanced Urogenital Diseases Research Center, Chung Ang University Hospital, Seoul, Republic of Korea.
4. Department of Urology, KEPCO Medical Foundation Hanil General Hospital, Seoul, Republic of Korea.