1 UCM Inter-centers Digestive Diseases and Ciberehd, University Hospital Virgen del Rocío, Spain; Institute of Biomedicine of Seville, University of Seville, Sevilla, Spain. Electronic address: mromerogomez@us.es.
2 Department of Gastroenterology, Hospital de Santa Maria, Laboratório de Nutrição, Faculdade de Medicina, Universidade de Lisboa, Portugal.