From the Department of Anesthesiology and Perioperative Medicine, University of California, San Francisco, California.
This article has supplementary material on the Web site:www.anesthesia-analgesia.org.
Accepted for publication July 22, 2008.
Address correspondence and reprint requests to Martin M. Stechert, MD, University of California, San Francisco, VA Medical Center, Department of Anesthesiology (129), 4150 Clement St., San Francisco, CA 94121. Address e-mail to firstname.lastname@example.org