[1] Aristotle Univ Thessaloniki, Papageorgiou Gen Hosp, Human Reprod Unit, Sch Med,Dept Obstet & Gynaecol, Thessaloniki 54603, Greece
[2] Kuwait Univ, Fac Med, Dept Obstet & Gynaecol, Safat 13110, Kuwait
[3] Odense Univ Hosp, Fertil Clin, DK-5000 Odense C, Denmark
[4] Dutch Speaking Brussels Free Univ, Acad Hosp, Dept Reprod Med, Brussels, Belgium