1. Department of Gastroenterology and Instituto de Investigación Sanitaria de Santiago (IDIS)University Hospital of Santiago de CompostelaSantiago de CompostelaSpain
2. Institute of MedicineSahlgrenska AcademyUniversity of GothenburgGothenburgSweden
3. Department of PathologyUniversity Hospital of Santiago de CompostelaSantiago de CompostelaSpain