1. American Center for Reproductive Medicine, Cleveland Clinic, OH, USA.
2. Texas College of Osteopathic Medicine, Fort Worth, TX, USA.
3. Department of Urology, Cleveland Clinic, Cleveland, OH, USA.
4. Department of Pediatrics, New York University School of Medicine, New York City, NY, USA.
5. Department of Medical Bioscience, University of the Western Cape, Bellville, South Africa.