1 Department of Anesthesiology, Division of Pain Medicine, University of Wisconsin School of Medicine and Public Health, Madison, WI.
2 Department of Anesthesia, Critical Care and Pain Medicine, Massachusetts General Hospital, Harvard Medical School, Boston, MA.
3 Johns Hopkins School of Medicine, Baltimore, MD.
4 Department of Anesthesia, Critical Care and Pain Medicine, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA.
5 Department of Anesthesiology, Creighton University School of Medicine, Omaha, NE; Valley Anesthesiology and Pain Consultants, Envision Physician Services, Phoenix, AZ; and Department of Anesthesiology, University of Arizona College of Medicine-Phoenix, Phoenix, AZ.