1 Center of Reproductive Medicine and Andrology, University Hospital Münster, 48149 Münster, Germany.
2 Department of Women's and Children´s Health, Pediatric Endocrinology Unit, Karolinska Institut at Karolinska University Hospital Solna, 17176 Stockholm, Sweden.
3 Institute of Human Genetics, University Hospital Münster, 48149 Münster, Germany.
4 Molecular Sensory Systems, Center of Advanced European Studies and Research, 53175 Bonn, Germany.
5 Center of Reproductive Medicine and Andrology, University Hospital Münster, 48149 Münster, Germany; timo.struenker@ukmuenster.de.