Affiliation: | 1st Medical Clinic, University of Bologna and Oncology Department, S. Orsola and M. Malpighi Hospital, Bologna, Italy;Department of Microbiology, University College London Medical School, London, England;GI Section, Treviglio Hospital, Bergamo, Italy;Department of Internal Medicine, G. B. Morgagni Hospital, Forli, Italy;GI Section, S. Andrea Hospital, Vercelli, Italy;and GI Section, Maggiore Hospital, Crema, Italy |