1 IBD Unit, Gastroenterology Department, Hospital de Galdakao and Biocruces Bizkaia Health Research Institute, Galdakao, Spain.
2 Center for Cooperative Research in Biosciences (CIC bioGUNE), Basque Research and Technology Alliance (BRTA), Derio, Spain and, IKERBASQUE, Basque Foundation for Science, Bilbao, Spain.
3 IBD Unit, Gastroenterology Department, Hospital Clínico Universitario de Santiago, Santiago de Compostela, Spain.