Department of Health Promotion & Development, University of Pittsburgh School of Nursing, 440 Victoria Building, Pittsburgh, PA, 15261, USA. jvr5@pitt.edu. Department of Pediatrics, University of Pittsburgh School of Medicine, Pittsburgh, PA, USA. jvr5@pitt.edu. Department of Health Promotion & Development, University of Pittsburgh School of Nursing, 440 Victoria Building, Pittsburgh, PA, 15261, USA. Department of Epidemiology, University of Pittsburgh Graduate School of Public Health, Pittsburgh, PA, USA. Department of Obstetrics, Gynecology and Reproductive Sciences, University of Pittsburgh School of Medicine, Pittsburgh, PA, USA. Magee-Womens Research Institute, Pittsburgh, USA.