Hepner David L, Castells Mariana C
Departments of *Anesthesiology, Perioperative, and Pain Medicine and †Medicine, Brigham and Women's Hospital, Harvard Medical School, Boston, Massachusetts.
Anesth Analg. 2003 Apr;96(4):1219-1229. doi: 10.1213/01.ANE.0000050768.04953.16.