1. Department of Anesthesiology, Hartford Hospital, Hartford, Connecticut2Department of Anesthesiology, University of Connecticut School of Medicine, Farmington
2. Department of Anesthesiology, Columbia University College of Physicians and Surgeons, New York, New York4Institut National de la Santé et de la Recherche Médicale, Unité Mixte de Recherche 1137, Infection, Antimicrobiens, Modélisation, Evolution, Paris, France
3. Department of Obstetrics and Gynecology, Columbia University College of Physicians and Surgeons, New York, New York
4. Department of Anesthesiology, Columbia University College of Physicians and Surgeons, New York, New York
5. Department of Anesthesiology, Columbia University College of Physicians and Surgeons, New York, New York6Department of Epidemiology, Columbia University Mailman School of Public Health, New York, New York