1. Department of Environmental Health, Exposure, Epidemiology and Risk Program, Harvard School of Public Health, Boston, Massachusetts, USA
2. Toxicological Center, University of Antwerp, Wilrijk, Belgium
3. Department of Environmental Health, Occupational Health Program, Harvard School of Public Health, Boston, Massachusetts, USA
4. Vincent Memorial Obstetrics and Gynecology Service, Andrology Laboratory and In Vitro Fertilization Unit, Massachusetts General Hospital, Boston, Massachusetts, USA