1. Department of Obstetrics and Gynaecology; Academic Medical Centre; Amsterdam the Netherlands
2. Department of Obstetrics and Gynaecology; Centro Rosarino de Estudios Perinatales; Rosario Argentina
3. Medical Library; Academic Medical Centre; Amsterdam the Netherlands
4. Department of Obstetrics and Gynaecology; VU Medical Centre; Amsterdam the Netherlands
5. The Robinson Institute; School of Paediatrics and Reproductive Health; University of Adelaide; Adelaide SA Australia