1. Department of Environmental Health Sciences, School of Public Health and Health Sciences, University of Massachusetts, 686 North Pleasant Street, Amherst, MA, USA
2. Department of Biostatistics and Epidemiology, School of Public Health and Health Sciences, University of Massachusetts, 715 North Pleasant Street, Amherst, MA, USA
3. Department of Obstetrics and Gynecology, Division of Reproductive Endocrinology and Infertility, University of Massachusetts Medical School, Baystate Medical Center, 759 Chestnut Street, Springfield, MA, USA