1 All of the authors are chairs of environmental health and science departments in schools of public health. Barbara J. Turpin is with the Gillings School of Global Public Health, University of North Carolina, Chapel Hill. Andrea Baccarelli is with the Mailman School of Public Health, Columbia University, New York, NY. Douglas W. Dockery is with Harvard T.H. Chan School of Public Health, Harvard University, Boston, MA. Dana C. Dolinoy is with the School of Public Health, University of Michigan, Ann Arbor. Jonathan I. Levy is with the School of Public Health, Boston University, Boston, MA. Yang Liu is with the Rollins School of Public Health, Emory University, Atlanta, GA. Melissa J. Perry is with the Milken Institute School of Public Health, George Washington University, Washington, DC. Justin V. Remais is with the School of Public Health, University of California, Berkeley. Marsha Wills-Karp is with the Bloomberg School of Public Health, Johns Hopkins University, Baltimore, MD.