1. University of California Los Angeles Department of Urology, David Geffen School of Medicine, , Los Angeles, CA 90095, United States
2. No affiliation/independent researcher
3. David Geffen School of Medicine Department of Surgery, Section of Colorectal Surgery, , Los Angeles, CA 90095, United States
4. Surgical and Perioperative Careline, VA Greater Los Angeles Healthcare System , Los Angeles, CA 90073, United States
5. Fielding School of Public Health Department of Health Policy and Management, , University of California, Los Angeles, Los Angeles, CA 90095, United States
6. University of California Los Angeles School of Nursing, , Los Angeles, CA, United States