Department of Epidemiology, Geisel School of Medicine at Dartmouth, Dartmouth College, Hanover, NH, 03756, USA. Margaret.R.Karagas@dartmouth.edu. Department of Biological Sciences, Dartmouth College, Hanover, NH, 03755, USA. Department of Systems, Populations and Leadership, University of Michigan, Ann Arbor, MI, 48109, USA. Department of Environmental Sciences and Engineering, Gillings School of Global Public Health, University of North Carolina, Chapel Hill, NC, 27599, USA. Department of Epidemiology, Geisel School of Medicine at Dartmouth, Dartmouth College, Hanover, NH, 03756, USA. Department of Public Health Sciences, University of Chicago, Chicago, IL, 60637, USA.