1. Department of Epidemiology, Boston University School of Public Health, Boston, Massachusetts, USA
2. Department of Clinical Epidemiology, Aarhus University Hospital, Aarhus University, Aarhus, Denmark
3. Division of Laboratory Sciences, Centers for Disease Control and Prevention, Atlanta, Georgia, USA
4. Division of Public Health Sciences, Henry Ford Health System, Detroit, Michigan, USA
5. Department of Obstetrics and Gynecology, Division of Reproductive Endocrinology and Infertility, University of Michigan, Ann Arbor, Michigan, USA
6. Department of Pathology and Laboratory Medicine, Alpert Medical School at Brown University, Providence, Rhode Island, USA