[1] Stanford Univ, Sch Med, Div Gastroenterol & Hepatol, 300 Pasteur Dr, Stanford, CA 94304 USA
[2] Univ Calif San Diego, Nonalcohol Fatty Liver Dis Res Ctr, La Jolla, CA 92093 USA
[3] Univ Calif San Diego, Div Gastroenterol & Hepatol, La Jolla, CA 92093 USA