1. Institute of Biology and Medical Genetics, First Faculty of Medicine, Charles University in Prague, Praha, Czech Republic
2. Max-Delbrück-Center for Molecular Medicine, Berlin, Germany
3. Department of Cell Biology and Anatomy, The Sophie Davis School of Biomedical Education, New York, New York
4. Institute of Anatomy, First Faculty of Medicine, Charles University in Prague, Praha, Czech Republic
5. Department of Pediatrics, Technical University Dresden, Dresden, Germany
6. Center for Reproductive Medicine, Academic Medical Center, Amsterdam, The Netherlands
7. Department of Endocrinology and Metabolism, Utrecht University, Utrecht, The Netherlands