References
- Thompson W G, Heaton K W. Gastroenterology 1980; 79: 283–288
- Switz D M. Gastroenterology 1976; 70: 1040–1050
- Gomez J, Dally P. Br Med J 1977; 1: 1451–1453
- Vatn M H, Mogstad T E, Gjone E. Scand J Gastroenterol 1985; 20: 407–414
- Larssen T, Skarpaas E, Lowe P, Stokkeland M, Vatn M H. Tidsskr Nor Laegeforen 1983; 103: 1252–1255
- Waye J D. Gastrointest Endosc 1977; 23: 150–154
- Osnes M, Myren J, Løtveit T, Swensen T. Scand J Gastroenterol 1977; 12: 347–351