[1] Univ Med Sch Saarland, Dept Gynecol Obstet & Reprod Med, D-66421 Homburg, Germany
[2] Univ Med Sch Saarland, Dept Neurol, D-66421 Homburg, Germany
[3] Univ Med Ctr Freiburg, Dept Gynecol, D-79106 Freiburg, Germany
[4] Univ Med Sch Saarland, Dept Diagnost & Intervent Neuroradiol, D-66421 Homburg, Germany