1. NAFLD Research Center, Division of Gastroenterology. University of California at San Diego, La Jolla, California, USA
2. Division of Gastroenterology and Hepatology, University of California at San Diego, La Jolla, California, USA
3. Department of Metabolism, Liver unit/Division of Digestive Diseases, Digestion and Reproduction, Faculty of Medicine, Imperial College London, London, UK
4. School of Public Health, University of California at San Diego, La Jolla, California, USA