From the Department of Surgery, Maine Medical Center, Portland, Maine, and the Harvard Injury Control Research Center, Boston, Massachusetts.
Submitted for publication April 26, 2002.
Accepted for publication July 30, 2002.
Address for reprints: David E. Clark, MD, 887 Congress Street, Suite 210, Portland, ME 04102; email [email protected].
doi: 10.1097/01.TA.0000033498.07075.D1