Authors: J F Dowsett; D Vaira; A R Hatfield; S R Cairns; A Polydorou; R Frost; J Croker; P B Cotton; R C Russell; R R Mason Journal: Gastroenterology Date: 1989-04 Impact factor: 22.682
Authors: A G Speer; P B Cotton; R C Russell; R R Mason; A R Hatfield; J W Leung; K D MacRae; J Houghton; C A Lennon Journal: Lancet Date: 1987-07-11 Impact factor: 79.321