1. University of Athens; Assisted Reproduction Unit, 3rd Department of Obstetrics and Gynaecology; Attikon University Hospital, Rimini 1 Athens Chaidari Greece 12462
2. Faculty of Medicine, Mansoura University; Obstetrics & Gynaecology; Mansoura Egypt
3. University of Aberdeen; Division of Applied Health Sciences; Aberdeen UK AB25 2ZL
4. Aberdeen Maternity Hospital; Obstetrics and Gynaecology; Foresterhill Aberdeen UK AB9 2ZD