[1] NORTHWESTERN UNIV, SCH MED,DEPT SURG,DIV VASC SURG,13-504 SEARLE, 303 E CHICAGO AVE, CHICAGO, IL 60611 USA
[2] NORTHWESTERN UNIV, SCH MED, BLOOD FLOW LAB, CHICAGO, IL 60611 USA
[3] UNIV CALIF DAVIS, SACRAMENTO MED CTR, DAVIS MED CTR, SACRAMENTO, CA 95817 USA