Authors: H R Koelz; R Birchler; A Bretholz; B Bron; Y Capitaine; G Delmore; H F Fehr; I Fumagalli; J Gehrig; J J Gonvers Journal: Gastroenterology Date: 1986-11 Impact factor: 22.682
Authors: R F Harvey; P C Gordon; N Hadley; D E Long; T R Gill; R I Macpherson; B C Beats; A J Tottle Journal: Lancet Date: 1987-11-21 Impact factor: 79.321