1. Department of Laboratory Medicine and Pathobiology, University of Toronto
2. Department of Pathology and Laboratory Medicine, Mount Sinai Hospital
3. Department of Clinical Biochemistry, University Health Network, Toronto, Ontario, Canada
4. MRC Centre for Reproductive Health, University of Edinburgh, Edinburgh, UK
5. Division of Reproductive Endocrinology and Infertility, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, PA
6. Institute of Reproductive and Developmental Biology, Queen Charlotte's and Chelsea Hospital, Imperial College NHS Trust, London, UK
7. Department of Woman and Child, University Hospitals Leuven, Campus Gasthuisberg, Katholieke Universiteit Leuven, Leuven, Belgium
8. Department of Obstetrics and Gynaecology, Medical School, University of Thessaly, University Hospital, Larissa, Greece