1. Department of Obstetrics and Gynecology; University of Cincinnati College of Medicine; Cincinnati Ohio USA
2. Center for Prevention of Preterm Birth; Perinatal Institute; Cincinnati Children's Hospital Medical Center; Cincinnati Ohio USA
3. Department of Infectious Diseases; Cincinnati Children's Hospital; Cincinnati Ohio USA
4. Center for Perinatal Research; Nationwide Children's Hospital; Columbus Ohio USA
5. Cincinnati Children's Hospital; Division of Neonatology; Cincinnati Ohio USA
6. Research and Development; Mead Johnson Nutrition; Inc.; Evansville Indiana USA