Brittney M. Donovan 1, Rebecca J. Baer 2, 3, Patrick J. Breheny 4, Knute D. Carter 4, Jennifer G. Robinson 1, Audrey F. Saftlas 1, Wei Bao 1, Larry Rand 3, 5, Laura L. Jelliffe-Pawlowski 3, 6, Kelli K. Ryckman 1, 7
1 Department of Epidemiology, University of Iowa College of Public Health, Iowa City, IA
2 Department of Pediatrics, University of California San Diego, La Jolla, CA
3 The California Preterm Birth Initiative, University of California San Francisco, San Francisco, CA
4 Department of Biostatistics, University of Iowa College of Public Health, Iowa City, IA
5 Department of Obstetrics, Gynecology and Reproductive Sciences, University of California San Francisco, San Francisco, CA
6 Department of Epidemiology and Biostatistics, University of California San Francisco, San Francisco, CA
7 Department of Pediatrics, University of Iowa, Iowa City, IA