1. 1st Department of Obstetrics and Gynecology, Aristotle University of Thessaloniki, School of Medicine, Thessaloniki 541 24, Greece
2. Division of Biosciences, College of Health and Life Sciences, Brunel University London, Uxbridge UB8 3PH, UK
3. Centre for Assisted Reproduction ‘Biogenesis’, Thessaloniki 555 35, Greece