Luis Bujanda1
, María García-Barcina2
, Virginia Gutiérrez-de Juan1
, Joseba Bidaurrazaga3
, Marian Fernández de Luco4
, Marian Gutiérrez-Stampa1
, Mikel Larzabal5
, Elisabeth Hijona1
, Cristina Sarasqueta1
, Miguel Echenique-Elizondo6
and Juan I Arenas1 
1Department of Gastroenterology, Donostia Hospital, San Sebastián, Spain
2Department of Genetics, Basurto Hospital, Bilbao, Spain
3Department of Cellular Biology, Basque Country University, Spain
4Department of Pathology, Cruces Hospital, Baracaldo, Spain
5Department of Pathology, Donostia Hospital, Spain
6Department of Surgery, Basque Country University, San Sebastián, Spain