[1] UNIV CALIF, CARDIOVASC RES INST, METAB RES UNIT, SAN FRANCISCO, CA 94143 USA
[2] UNIV CALIF, DEPT PEDIAT, SAN FRANCISCO, CA 94143 USA
[3] UNIV CALIF, DEPT MED, SAN FRANCISCO, CA 94143 USA
[4] UNIV CALIF, DEPT BIOCHEM & BIOPHYS, SAN FRANCISCO, CA 94143 USA