[1] Univ Kiel, Dept Obstet & Gynecol, D-24098 Kiel, Germany
[2] Acad Hosp Mutterhaus Trier, Trier, Germany
[3] Univ Frankfurt, D-6000 Frankfurt, Germany
[4] Univ Dusseldorf, D-4000 Dusseldorf, Germany
[5] Klinikum Leverkusen, Leverkusen, Germany
[6] Univ Heidelberg, D-6900 Heidelberg, Germany
[7] Dr Horst Schmidt Clin, Wiesbaden, Germany
[8] Hoffmann La Roche AG, Grenzach Wyhlen, Germany