Medeiros De Carvalho, Tânia Tereza (3) Burns, S C (1) Cartwright, Peter (1) Henning, Molly (1) Haycock, Adam (consultant Physician & Gastroenterologist, St Mark's Hospital, London, Uk), Cohen, Jonathan (new York University School Of Medicine), Saunders, Brian P. (st. Mark's Hospital, Harrow), Cotton, Peter B. (medical University Of South (1)