1 Gastroenterology and Hepatology Department. Marqués de Valdecilla University Hospital, Santander, Spain; Research Institute Valdecilla (IDIVAL), Santander, Spain; School of Medicine, University of Cantabria, Santander, Spain.
2 Gastroenterology and Hepatology Department. Marqués de Valdecilla University Hospital, Santander, Spain; Research Institute Valdecilla (IDIVAL), Santander, Spain.
3 Gastroenterology and Hepatology Department. Marqués de Valdecilla University Hospital, Santander, Spain; Research Institute Valdecilla (IDIVAL), Santander, Spain. Electronic address: [email protected].