作者单位:Los Angeles Biomed Res Inst, Torrance, CA 90509 USA[1]Charles R Drew Univ Med & Sci, Div Endocrinol Metab & Mol Med, Los Angeles, CA 90059 USA[2]Univ Calif Los Angeles, Harbor Med Ctr, David Geffen Sch Med, Div Endocrinol, Torrance, CA 90509 USA[3]