1. Department of Environmental Health, Occupational Health Program, Harvard School of Public Health, Boston, Massachusetts, USA
2. Department of Nursing, School for Health Studies, Simmons College, Boston, Massachusetts, USA
3. National Center for Environmental Health, Centers for Disease Control and Prevention, Atlanta, Georgia, USA
4. Vincent Memorial Obstetrics and Gynecology Service, Andrology Laboratory and In Vitro Fertilization Unit, Massachusetts General Hospital, Boston, Massachusetts, USA