1. Department of Urology, David Geffen School of Medicine, Departments of Health Services and Community Health Sciences, School of Public Health and Jonsson Comprehensive Cancer Center, University of California-Los Angeles, Los Angeles, California
2. Tohoku University Graduate School of Medicine, Sendai, Japan
3. Departments of Urology, Kurashiki Central Hospital, Okayama, Japan
4. Kitasato University School of Medicine, Sagamihara, Japan