1 Department of Anesthesiology, University of Vermont Medical Center, Burlington, Vermont.
2 Departments of Anesthesiology, Orthopaedics and Rehabilitation (by courtesy), and Surgery (by courtesy), University of Vermont Larner College of Medicine, Burlington, Vermont, mitchell.tsai@uvmhealth.org.
3 Department of Anesthesiology, Geisel School of Medicine, Dartmouth Hitchcock Medical Center, Lebanon, New Hampshire.