[1] Pius Hosp Oldenburg, Univ Hosp Gynecol, Dept Gynecol Obstet & Gynecol Oncol, Oldenburg, Germany
[2] Heidelberg Univ, Dept Obstet & Gynecol, Heidelberg, Germany
[3] Univ Naples Federico II, Dept Publ Hlth, Naples, Italy
[4] Nicosia Univ, St Georges Med Sch, Aretaeio Hosp, Nicosia, Cyprus
[5] Goethe Univ Frankfurt, Dept Obstet & Gynecol, Frankfurt, Germany