1. Department of Clinical Biochemistry, Royal Infirmary, Edinburgh, UK
2. Institute for Biomedical Aging Research, Austrian Academy of Sciences, Innsbruck, Austria
3. Department of Clinical Biology, Institut Gustave-Roussy, Villejuif, France
4. Department of Obstetrics and Gynecology, College of Physicians and Surgeons of Columbia University, NY, NY
5. National Institute of Biological Standards and Control, Potters Bar, UK
6. Research Centre for Reproductive Health, Department of Obstetrics and Gynaecology, University of Adelaide, The Queen Elizabeth Hospital, Woodville, Australia
7. Department of Clinical Chemistry, Helsinki University Central Hospital, Finland