1. Midwestern University College of Osteopathic Medicine, Downers Grove, Illinois, USA.
2. Division of Urology, Department of Surgery, Mayo Clinic, Rochester, Minnesota, USA.
3. Pasadena City College, Pasadena, California, USA.
4. University of California Riverside, Riverside, California, USA.
5. Department of Biostatistics, City of Hope National Medical Center, Duarte, California, USA.