[1] UNIV BOLOGNA,MED CLIN 1,I-40126 BOLOGNA,ITALY
[2] UNIV BOLOGNA,DEPT ONCOL,I-40126 BOLOGNA,ITALY
[3] GB MORGAGNI L PIERANTONI HOSP,DEPT INTERNAL MED,FORLI,ITALY
[4] TREVIGLIO HOSP,GI SECT,BERGAMO,ITALY
[5] S ANDREA HOSP,VERCELLI,ITALY
[6] UNIV LONDON UNIV COLL,LONDON WC1E 6BT,ENGLAND