University of Basel - Department of Obstetrics and Gynaecology, Medical University of Vienna - Department of Obstetrics and Gynaecology, Paracelsus Medical University Salzburg - Department of Obstetrics and Gynaecology, Cantonal Hospital Aarau - Department of Obstetrics and Gynaecology, University Hospital Zurich - Department of Obstetrics and Gynaecology, University Hospital Freiburg - Department of Obstetrics and Gynaecology, University of Basel - Clinical Trial Unit, Paracelsus Medical University Salzburg - Department of Obstetrics and Gynaecology, Paracelsus Medical University Salzburg - Department of Obstetrics and Gynaecology, Cantonal Hospital Aarau - Department of Obstetrics and Gynaecology, Medical University of Vienna - Department of Obstetrics and Gynaecology, Medical University of Vienna - Department of Obstetrics and Gynaecology, University Hospital Zurich - Department of Obstetrics and Gynaecology, University Hospital Zurich - Department of Obstetrics and Gynaecology, University Hospital Freiburg - Department of Obstetrics and Gynaecology, University of Basel - Department of Endocrinology, Diabetes and Metabolism and University of Basel - Department of Obstetrics and Gynaecology