1. Endoscopy Unit Germans Trias i Pujol University Hospital Barcelona Spain
2. Network Biomedical Research Center of Hepathic and Digestive Diseases (CIBERehd) CSIC and The Barcelona Institute of Science and Technology Barcelona Spain
3. Catalan Institute of Nanoscience and Nanotechnology CSIC and The Barcelona Institute of Science and Technology Barcelona Spain
4. Department of Pathology Germans Trias i Pujol University Hospital Barcelona Spain