1 From Divisions of Cardiovascular Medicine (J.R.L.) and Vascular Surgery (M.H.), the Vascular Center, University of California, Davis Medical Center, Sacramento, CA. jrlaird@ucdavis.edu.
2 From Divisions of Cardiovascular Medicine (J.R.L.) and Vascular Surgery (M.H.), the Vascular Center, University of California, Davis Medical Center, Sacramento, CA.