1 Department of Gastroenterology, Catholic University of Chile/Hospital San Borja Arriaran, Santiago, Chile.
2 Department of Gastroenterology, Catholic University of Chile, Santiago, Chile.
3 Inflammatory Bowel Disease Center, Division of Gastroenterology, University of California San Diego, San Diego, California.
4 Division of Immunology and Allergy, Center of Molecular Medicine, Department of Medicine, 17176 Karolinska Institutet and University Hospital, Stockholm, Sweden.