1. Department of Pediatrics University of California San Francisco San Francisco CA
2. Department of Epidemiology and Biostatistics University of California San Francisco San Francisco CA
3. California Preterm Birth Initiative University of California San Francisco San Francisco CA
4. Department of Pediatrics University of California San Diego La Jolla CA
5. Department of Obstetrics, Gynecology, and Reproductive Sciences University of California San Francisco San Francisco CA
6. Department of Epidemiology College of Public Health University of Iowa Iowa City IA
7. Department of Genetics Stanford University Stanford CA