[1] Univ Hosp Freiburg, Dept Internal Med 2, Freiburg, Germany
[2] Univ Hosp Attikon, Dept Obstet & Gynecol 3, Athens, Greece
[3] Univ Hosp Tuebingen, Dept Internal Med 4, Tubingen, Germany
[4] Univ Hosp Freiburg, Dept Gynecol & Obstet, Freiburg, Germany