1. Antigen Presentation Research Group, Imperial College London; Northwick Park & St Mark's Campus; Watford Road Harrow United Kingdom
2. Department of Paediatrics & Immunology, Mucosal Immunology Lab, Universidad de Valladolid; IBGM-CSIC, Valladolid; Spain
3. Service of Gastroenterology; Hospital Universitario Rio Hortega; Valladolid Spain
4. Department of Gastroenterology, St Mark's Hospital; North West London Hospitals NHS Trust; Harrow United Kingdom
5. Gastroenterology Service; Hospital Clínico Universitario de Valladolid; Valladolid Spain
6. Genetics and Molecular Biology Lab, Service of Clinical Laboratory; Hospital Universitario Río Hortega; Valladolid Spain