Prepared by Manju Goyal, MD, Todd C. Villines, MD, Lance E. Sullenberger, MD, Eddie Hulten, MD, MPH, and Irwin M. Feuerstein, MD, Walter Reed Army Medical Center, Washington, DC.

The opinions or assertions herein are the private views of the authors and are not to be construed as reflecting the views of the Department of the Army or the Department of Defense.