Brigham and Women's Hospital, Harvard Medical School Boston, Massachusetts
Reprints: Lawrence C. Tsen, MD, Department of Anesthesiology, Perioperative and Pain Medicine, Brigham and Women's Hospital, 75 Francis Street, CWN-L1, Boston, MA 02115, E-mail: [email protected]
No sources of support need be acknowledged.
doi: 10.1097/AIA.0b013e31802b8c00