1. BCN-MedTech; Department of Information and Communication Technologies; Universitat Pompeu Fabra; Barcelona 08018 Spain
2. CommSensLab; Department of Signal Theory and Communications; Universitat Politècnica de Catalunya; Barcelona 08034 Spain
3. Endoscopy Unit; Institut de Malalties Digestives i Metabòliques; IDIBAPS; CIBERehd; Hospital Clínic; Universitat de Barcelona; Barcelona 08036 Spain
4. Pathology Department; CDB; Hospital Clínic; IDIBAPS; Universitat de Barcelona; Banc de Tumors Biobanc Clinic-IDIBAPS; Barcelona 08036 Spain
5. ICREA; Barcelona 08010 Spain