Authors: R D Marks; J E Richter; J Rizzo; R E Koehler; J G Spenney; T P Mills; G Champion Journal: Gastroenterology Date: 1994-04 Impact factor: 22.682
Authors: S Vigneri; R Termini; G Leandro; S Badalamenti; M Pantalena; V Savarino; F Di Mario; G Battaglia; G S Mela; A Pilotto Journal: N Engl J Med Date: 1995-10-26 Impact factor: 91.245