1 Gastroenterology and Hepatology Department, Marqués de Valdecilla University Hospital, Clinical and Translational Research in Digestive Diseases, Valdecilla Research Institute (IDIVAL), Santander, Spain.
2 Gastroenterology Department, Hepatology Unit, Hospital Universitario Puerta de Hierro, IDIPHISA, Madrid, Spain.
3 Gastroenterology and Hepatology Department, Marqués de Valdecilla University Hospital, Clinical and Translational Research in Digestive Diseases, Valdecilla Research Institute (IDIVAL), Santander, Spain. Electronic address: javiercrespo1991@gmail.com.