[1] Dutch Speaking Brussels Free Univ, Ctr Reprod Med, B-1090 Brussels, Belgium
[2] Cairo Univ, Egyptial IVF ET Ctr, Cairo 1143, Egypt
[3] Inst Valenciano Infertilidad Madrid, Madrid, Spain
[4] Univ Clin Schleswig Holstein, Dept Obstet & Gynecol, Lubeck, Germany
[5] Viborg Hosp Skive, Fertil Clin, DK-7800 Skive, Denmark
[6] Aristotle Univ Thessaloniki, Papageorgiou Gen Hosp, Dept Obstet & Gynecol 1, Human Reprod Unit, Thessaloniki 54603, Greece
[7] Univ Sheffield, Sheffield Teaching Hosp Trust, Ctr Reprod Med & Fertil, Sheffield S10 2SF, S Yorkshire, England
[8] Fertil Ctr, AVA Clin, Tampere, Finland
[9] Univ Med Ctr, Dept Reprod Med & Gynecol, NL-3584 CX Utrecht, Netherlands