1. Department of Gynaecology and Obstetrics; Radboud University Medical Center; Nijmegen Netherlands
2. Department of Obstetrics and Gynaecology; Auckland City Hospital; Auckland New Zealand
3. Department of Obstetrics and Gynaecology, Faculty of Medical and Health Sciences; The University of Auckland; Auckland New Zealand
4. Department of Obstetrics and Gynaecology; Jeroen Bosch Hospital; 's-Hertogenbosch Netherlands