Robert B Maniker1, Rebecca L Johnson2, De Q Tran3. 1. From the Department of Anesthesiology and Perioperative Medicine, Columbia University College of Physicians and Surgeons, New York, New York. 2. Department of Anesthesiology, Mayo Clinic College of Medicine, Rochester, Minnesota. 3. Department of Anesthesiology, Montreal General Hospital, McGill University, Montreal, Quebec, Canada.