1. Department of Obstetrics and Gynaecology, Faculty of Medicine, School of Health Sciences, University of Thessaly, Larissa, Greece
2. Department of Physiology, School of Health Sciences, National and Kapodistrian University of Athens, Athens, Greece
3. Department of Obstetrics and Gynaecology, Norfolk and Norwich University Hospitals, Norwich Medical School, University of East Anglia, Norwich, UK