References
- Jones D B, Howden C W, Burget D W, Kerr G D, Hunt R H. Gut 1987; 28: 1120–1127
- Merki H, Witzel L, Harre K, Scheurle E, Neumann J, Röhmer J. Gut 1987; 28: 451–454
- Bauerfeind P, Cilluffo T, Emde C, Fimmel C J, Köhler W, Merki H, Gasser T. Gastroenterology 1986; 90: 1340
- Merki H, Witzel L, Huttemann W, Ansari A, Paniel M, Harre K, Scheurle E. Gastroenterology 1987; 90: 1550
- Berstad A. Scand J Gastroenterol 1970; 5: 343–348
- Boyd E JS, Wilson J A, Wormsley K G. Scand J Gastroenterol 1983; 18: 193–200