Affiliation: | (1) ZEG - Center for Epidemiology & Health Research Berlin, Invalidenstr. 115, 10115 Berlin, Germany;(2) NFO Health Europe, Landsberger Straβe 338, 80687 Munich, Germany;(3) Department of Obstetrics and Gynecology, , Von-Esmarch-Strasse 56, 48149 Muenster, Germany |