1. Department of Urology, Severance Hospital, Urological Science Institute, Yonsei University College of Medicine, Seoul, Korea.
2. Department of Urology, Yangpyeong Health Center, Yangpyeong, Korea.
3. Division of Epidemic Intelligence Service, Korea Centers for Disease Control and Prevention, Osong, Korea.
4. Department of Pathology, Severance Hospital, Yonsei University College of Medicine, Seoul, Korea.
5. Department of Urology, Gangnam Severance Hospital, Urological Science Institute, Yonsei University College of Medicine, Seoul, Korea.