1. Institute of Human Genetics; University of Münster; Münster Germany
2. Institute of Reproductive and Regenerative Biology; University of Münster; Münster Germany
3. Division of Endocrinology and Metabolism; Department of Internal Medicine; University of Turin; Turin Italy
4. Department of Clinical Andrology; Centre of Reproductive Medicine and Andrology; University of Münster; Münster Germany
5. Department of Biomedicine, Metabolism and Neural Sciences; Azienda USL di Modena, NOCSAE; University of Modena and Reggio Emilia; Modena Italy