1. Department of Anesthesiology, Duke University School of Medicine, Durham, North Carolina
2. Critical Care and Perioperative Population Health Research (CAPER) Unit, Department of Anesthesiology, Duke University School of Medicine, Durham, North Carolina
3. Department of Biostatistics and Bioinformatics, Duke University School of Medicine, Durham, North Carolina
4. Division of Maternal-Fetal Medicine, Department of Obstetrics and Gynecology, Duke University School of Medicine, Durham, North Carolina
5. Department of Gynecology and Obstetrics, The Johns Hopkins School of Medicine, Baltimore, Maryland
6. Division of Cardiology, Department of Medicine, Duke University School of Medicine, Durham, North Carolina
7. Duke Clinical Research Institute, Duke University School of Medicine, Durham, North Carolina.