1. From the Division of Urology, Department of Surgery, University of Louisville School of Medicine, Louisville, Kentucky
2. Section of Male Infertility, Department of Urology, Cleveland Clinic Foundation, Cleveland, Ohio
3. Division of Urology, Department of Surgery, The Oregon Health Sciences University, Portland, Oregon
4. Section of Urology, Department of Surgery, University of Michigan Medical School, Ann Arbor, Michigan
5. Department of Urology, University of California at San Francisco, San Francisco, California