1. Monash University; Department of Obstetrics and Gynaecology; Clayton VIC Australia 3168
2. The University of Adelaide; Robinson Research Institute and Adelaide Medical School; Adelaide SA Australia 5005
3. Academic Medical Center, University of Amsterdam; Center for Reproductive Medicine; Meibergdreef 9 Amsterdam Netherlands 1105 AZ
4. UMC Utrecht; Department of Biostatistics and Research Support, Julius Center; PO Box 85500 Utrecht Netherlands 3508GA
5. Academic Medical Center, University of Amsterdam; Department of Clinical Epidemiology, Biostatistics and Bioinformatics; Room J1b-217, PO Box 22700 Amsterdam Netherlands 1100 DE
6. Amsterdan UMC, University of Amsterdam; Center for Reproductive Medicine; Meibergdreef 9 Amsterdam Netherlands 1105 AZ
7. Aberdeen Maternity Hospital; Obstetrics and Gynaecology; Foresterhill Aberdeen UK AB9 2ZD
8. Amsterdam UMC, University of Amsterdam; Center for Reproductive Medicine; Meibergdreef 9 Amsterdam Netherlands 1105 AZ