1. Institute of Reproductive and Regenerative Biology; Centre of Reproductive Medicine and Andrology; University Clinics of Münster; Münster; Germany
2. Institute of Human Genetics; University of Münster; Münster; Germany
3. Institute of Human Genetics; Julius Maximilians University Würzburg; Würzburg; Germany
4. Department of Clinical Andrology; Centre of Reproductive Medicine and Andrology; University Clinics of Münster; Münster; Germany