1 Institute for Molecular Biology of Barcelona, National Research Council, Barcelona, Spain.
2 Networked Biomedical Research Center for Hepatic and Digestive Diseases (CIBER-EHD), Madrid, Spain.
3 Department of Pathology, Hospital Clínic de Barcelona, August Pi i Sunyer Biomedical Research Institute (IDIBAPS) and Universitat de Barcelona, Barcelona, Spain.