1. The University of Adelaide; Discipline of Obstetrics and Gynaecology, School of Medicine, Robinson Research Institute; Level 6, Medical School North, Frome Rd Adelaide SA Australia 5005
2. Academic Medical Center, University of Amsterdam; Department of Clinical Epidemiology, Biostatistics and Bioinformatics; Room J1b-217, PO Box 22700 Amsterdam Netherlands 1100 DE
3. IVF Australia; Westmead Fertility Clinic; Level 2 20-22 Mons Road, Westmead Sydney Victoria Australia 2145
4. University of Auckland; Department of Obstetrics and Gynaecology; FMHS Park Road Grafton Auckland New Zealand 1003
5. University of Groningen; Wenckebachlaan 53 Groningen Groningen Netherlands 9728 JL