1. Department of Urology, Loma Linda University Medical Center, Loma Linda, CA, USA.
2. Division of Female Pelvic Medicine and Reconstructive Surgery, Department of Gynecology and Obstetrics, Loma Linda University Medical Center, Loma Linda University, Loma Linda, CA, USA.
3. Department of Public Health, Loma Linda University, Loma Linda, CA, USA.