1. Division of Epidemiology and Biostatistics, Department of Environmental Health, University of Cincinnati College of Medicine, Cincinnati, Ohio, USA
2. Division of General and Community Pediatrics, Cincinnati Children's Hospital Medical Center, Cincinnati, Ohio, USA
3. Department of Obstetrics and Gynecology, Washington Hospital Center, Washington, DC, USA
4. Department of Obstetrics and Gynecology, University of California – Davis, Sacramento, California, USA
5. Division of Cardiology, Cincinnati Children's Hospital Medical Center, Cincinnati, Ohio, USA
6. Division of Maternal-Fetal Medicine, Department of Obstetrics and Gynecology, University of Cincinnati College of Medicine, Cincinnati, Ohio, USA