MacKnight Brenda M, Stearns Joshua D, Vricella Luca A, Resar Jon R
Department of Anesthesiology and Critical Care Medicine, Johns Hopkins University, Baltimore, Maryland 21287, USA.
Anesth Analg. 2007 Nov;105(5):1229-30. doi: 10.1213/01.ane.0000281047.58095.cc.