From the Department of Anesthesiology, Mayo Clinic, Jacksonville, Florida.
This article has supplementary material on the Web site:www.anesthesia-analgesia.org.
Accepted for publication May 24, 2006.
Financial support provided by Mayo Clinic and Mayo Foundation.
Address correspondence and reprint requests to Barry A. Harrison, MBBS, Department of Anesthesiology, Mayo Clinic, 4500 San Pablo Rd., Jacksonville, FL 32224. Address e-mail to email@example.com.