1. In vitro Fertilization Unit; Sofia Hospital of Obstetrics, Gynaecology and Reproductive Medicine; Sofia Bulgaria
2. Faculty of Biology; Sofia University “St. Kliment Ohridski”; Sofia Bulgaria
3. IGENOMIX; Valencia Spain
4. Infertility Institute; INCLIVA Biomedical Research; Valencia Spain
5. Department of Obstetrics and Gynecology; Valencia University; Valencia Spain