Rebecca J. Baer 1, 2, Gretchen Bandoli 2, Brittany D. Chambers 3, 4, Christina D. Chambers 2, Scott P. Oltman 1, 5, Larry Rand 1, 6, Kelli K. Ryckman 7, Laura L. Jelliffe-Pawlowski 1, 5
1 California Preterm Birth Initiative, University of California San Francisco, San Francisco, CA
2 Department of Pediatrics, University of California San Diego, La Jolla, CA
3 Department of Epidemiology and Biostatistics, University of California San Francisco, San Francisco, CA
4 California Preterm Birth Initiative, University of California San Francisco, San Francisco, CA
5 Department of Epidemiology and Biostatistics, University of California San Francisco, San Francisco, CA
6 Obstetrics, Gynecology & Reproductive Sciences, University of California SF, San Francisco, CA
7 Departments of Epidemiology and Pediatrics, University of Iowa, Iowa City, IA