1. Department of Obstetrics and Gynaecology; Academic Medical Centre Amsterdam; Amsterdam the Netherlands
2. Department of Obstetrics and Gynaecology; Vrije Universiteit Medical Centre; Amsterdam the Netherlands
3. Medical Library; Academic Medical Centre; Amsterdam the Netherlands
4. Department of Obstetrics and Gynaecology; University Medical Centre; Utrecht the Netherlands
5. The Robinson Institute; School of Paediatrics and Reproductive Health; University of Adelaide; Adelaide SA Australia