1. Division of Maternal Fetal Medicine, Department of Obstetrics, Gynecology, and Women's Health, Saint Louis University/SSM Health, St. Louis, Missouri, USA.
2. Department of Health and Clinical Outcomes Research, Advanced HEAlth Data (AHEAD) Research Institute, Saint Louis University, St. Louis, Missouri, USA.
3. Department of Epidemiology and Biostatistics, College of Public Health and Social Justice, Saint Louis University, St. Louis, Missouri, USA.