作者单位:Duke Univ, Med Ctr, Duke Mol Physiol Inst, Sarah W Stedman Nutr & Metab Ctr, Durham, NC USA[1]Univ N Carolina, Sch Med, Chapel Hill, NC USA[2]Univ N Carolina, Dept Genet, Chapel Hill, NC USA[3]Univ N Carolina, Dept Pathol & Lab Med, Chapel Hill, NC USA[4]