1. Department of Obstetrics and Gynaecology, University Hospital Frankfurt, Goethe-University, Frankfurt, Germany;
2. Department of Obstetrics and Gynaecology, Midwifery Division, Montfort Hospital, Ottawa, Canada;
3. Department of Epidemiology and Community Medicine, University of Ottawa, Ottawa, Canada;
4. Department of Pediatrics, Division Neonatology, University Hospital Frankfurt, Goethe-University, Frankfurt, Germany;
5. Department of Obstetrics and Gynecology, Royal Hospital for Women, University of New South Wales, Randwick, Australia