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