1. Obstetrics and Gynecology Department; ‘Konstantopoulio’ General Hospital, N. Ionia; Athens Greece
2. Second Department of Obstetrics and Gynecology, Medical School; University of Athens ‘Aretaieio’ Hospital; Athens Greece
3. Fetal Medicine Unit; ‘EmbryoCare’; Athens Greece
4. Clinical Chemistry Laboratory; ‘Diamedica SA’; Athens Greece
5. Hormone Laboratory, Second Department of Obstetrics and Gynecology, Medical School; University of Athens, ‘Aretaieio’ Hospital; Athens Greece