1. Department of Obstetrics; Wilhelmina Children's Hospital; University Medical Center Utrecht; Utrecht the Netherlands
2. Department of Obstetrics and Gynecology; Gelre Hospitals Apeldoorn; Apeldoorn the Netherlands
3. Department of Fertility; University Medical Center Utrecht; Utrecht the Netherlands
4. Department of Neonatology; Wilhelmina Children's Hospital; University Medical Center Utrecht; Utrecht the Netherlands