1. Center for Prevention of Preterm Birth; Perinatal Institute, Cincinnati Children's Hospital Medical Center; Cincinnati Ohio
2. Department of Pediatrics; University of Cincinnati College of Medicine; Cincinnati Ohio
3. Department of Ecology and Evolutionary Biology; Yale University; New Haven Connecticut
4. Yale Systems Biology Institute; Yale University; West Haven Connecticut
5. Department of Obstetrics, Gynecology and Reproductive Sciences; Yale Medical School; New Haven Connecticut
6. Department of Obstetrics and Gynecology; Wayne State University; Detroit Michigan