[1] UNIV CALIF SAN FRANCISCO, DEPT ANAT, SAN FRANCISCO, CA 94143 USA
[2] UNIV CALIF SAN FRANCISCO, DEPT MED, SAN FRANCISCO, CA 94143 USA
[3] UNIV CALIF SAN FRANCISCO, CARDIOVASC RES INST, SAN FRANCISCO, CA 94143 USA
[4] VET ADM MED CTR, RES SERV, SAN FRANCISCO, CA 94121 USA