Centre for Reproductive Medicine, Universitair Ziekenhuis Brussel, Vrije Universiteit Brussel, Laarbeeklaan 101-1090 Brussels, Belgium Department of General Surgery and Medical Surgical Specialties, University of Catania, Via Santa Sofia 78, 95125, Catania, Italy Department of Obstetrics, Gynecology, Perinatology and Reproduction, Institute of Professional Education, Sechenov First Moscow State Medical University of the Ministry of Health of the Russian Federation, Trubetskaya str., 8, b.