REFERENCES
- Dodds, W. J., Stef, J. J. & Hogan, W. J. Gastroenterology 1976, 70, 117–123
- Ellis, F. H. Surg. Clin. N. Amer. 1971, 51, 553–565
- Hunt, P. S., Connell, A. M. & Smiley, T. B. Gut 1970, 11, 303–306
- Palmer, E. D. Gastroenterology 1976, 71, 510–519
- Stanciu, C. & Bennett, J. R. Thorax 1974, 29, 459–462
- Warburg, E. Acta Physiol. Scand. 1950, 19, 344–349
- Winans, C. S. Gastroenterology 1972, 63, 768–777