From the *Department of Anesthesiology, Henry Ford Hospital, Detroit, Michigan; and †Department of Anesthesiology and Critical Care Medicine, Hospital of the University of Pennsylvania, Philadelphia, Pennsylvania.
This article has supplementary material on the Web site: www.anesthesia-analgesia.org.
Accepted for publication August 1, 2008.
Address correspondence and reprint requests to Jonathan K. Frogel, MD, Department of Anesthesiology, Henry Ford Hospital, 2799 West Grand Blvd., Detroit, MI 48202. Address e-mail to firstname.lastname@example.org.