1. Medical Center - Univ. of Freiburg, Faculty of Medicine, Univ. of Freiburg; Cochrane Germany; Breisacher Straße 153 Freiburg Germany 79110
2. Cologne Germany
3. Faculty of Medicine and Medical Center - University of Freiburg; Institute for Medical Biometry and Statistics; Stefan-Meier-Str. 26 Freiburg Germany 79104
4. University Hospital Frankfurt, Goethe University; Department of Obstetrics and Gynaecology; Frankfurt Germany
5. Medical Center - University of Freiburg, Faculty of Medicine, University of Freiburg; Center for Medical Biometry and Medical Informatics; Stefan-Meier-Str. 26 Freiburg Germany 79104
6. University Medical Center Freiburg; Pediatric Hematology & Oncology, Center for Pediatrics & Adolescent Medicine; Mathildenstrasse 1 Freiburg Germany 79106
7. University Hospital Zurich and University of Zurich; Department of Neonatology; Frauenklinikstrasse 10 Zurich Switzerland