1. Materno-fetal & Obstetrics Research Unit, Department of Obstetrics and Gynecology; University Hospital; 1011 Lausanne Switzerland
2. Department of Obstetrics and Gynecology; University Hospitals Leuven; Leuven Belgium
3. Department of Pediatric Surgery; University Hospital; 1011 Lausanne Switzerland
4. Service of Neonatology; University Hospital; 1011 Lausanne Switzerland