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From the Department of Anesthesiology, Division of Obstetric Anesthesia, University
of Michigan Health System, Ann Arbor, Michigan; Department of Anesthesia, Critical
Care and Pain Medicine, Massachusetts General Hospital; Department of Medicine, Division
of Pharmacoepidemiology and Pharmacoeconomics, Brigham and Women's Hospital; Harvard
Medical School, Boston, Massachusetts; Department of Obstetrics and Gynecology, Division
of Maternal Fetal Medicine, Oakland University William Beaumont School of Medicine,
Royal Oak; and Department of Anesthesiology, University of Michigan Health System,
Ann Arbor, Michigan.