Department of Pediatrics, the Mildred Stahlman Division of Neonatology, the Vanderbilt Center for Health Services Research, the Department of Health Policy, the Vanderbilt Center for Addiction Research, the Institute for Medicine and Public Health, the Department of Biostatistics, and the Department of Obstetrics and Gynecology, Vanderbilt University Medical Center, Nashville, Tennessee.
Corresponding author: Katherine E. Hartmann, MD, PhD, Women's Health Research at Vanderbilt, 2525 West End Avenue, Suite 600, 6th Floor, Nashville, TN 37203; email: [email protected].
Field research was supported by grants from the Eunice Kennedy Shriver National Institute of Child Health and Human Development of the National Institutes of Health (NIH; R01HD043883 and R01HD049675) and the American Water Works Association Research Foundation (2579) with additional infrastructure resources provided by UL1TR000445, a CTSA award from the NIH National Center for Advancing Translational Sciences. Salary support was provided by NIH 5T32HD068256-05 and the John and Leslie Hooper Neonatal-Perinatal Endowment Fund (J.P.) and the National Institute on Drug Abuse of the National Institutes of Health under award number K23DA038720 (S.W.P.).
Financial Disclosure The authors did not report any potential conflicts of interest.
The authors thank Nicholas J. Strayer for developing the script for visual display of distribution of study events.
Each author has indicated that he or she has met the journal’s requirements for authorship.