REFERENCES
- Alexander-Williams, J., Donovan, I. A., Gunn, I. F., Brown, A., & Harding, L. K. Proc. Roy. Soc. Med. 1973, 66, 1102
- Brassinne, A., & Merchie, G. J. Beige. Radiol. 1976, 59, 143
- Calderon, M., Sonnemaker, R. E., Hersh, T., & Burdine, J. A. Radiology 1971, 101, 371
- Chaudhuri, T. K. J. Nucl. Med. 1974, 15, 391
- Coates, G., Gilday, D. L., Cradduck, T. D., & Wood, D. E. Canad. Med. Ass. J. 1973, 108, 180
- Colmer, M. R., Owen, G. M., & Shields, R. Brit. Med. J. 1973, 2, 448
- Cowley, D. J., Vernon, P., Jones, T., Glass, H. I., & Cox, A. G. Gut 1972, 13, 176
- Davies, W. T., Griffith, G. H., Owen, G. M., & Shields, R. Brit. J. Surg. 1974, 61, 509
- Donovan, I. A. p. 258 In Fifth International Symposium on Gastrointestinal Motility, Leuven, Belgium, Sept 1975. Typoff-press, B-2410 Herentals, Belgium
- Donovan, I. A. Ann. Roy. Coll. Surg. Engl. 1976, 58, 368
- Griffith, G. H., Owen, G. M., Campbell, H., & Shields, R. Gastroenterology 1968, 54, 1
- Griffith, G. H., Owen, G. M., Kirkman, S., & Shields, R. Lancet 1966, 1, 1244
- Hancock, B. D., Bowen-Jones, E., Dixon, R., Testa, T., Dymock, I. W., & Cowley, D. J. Brit. J. Surg. 1974, 61, 945
- Harvey, R. F., Mackie, D. B., Brown, N. J. G., Keeling, D. H., & Davies, W. T. Lancet 1970, 1, 16
- Heading, R. C., Tothill, P., McLoughlin, G. P., & Shearman, D. J. C. Gastroenterology 1976, 71, 45
- Howlett, P. J., Ward, A. S., & Duthie, H. L. Proc. Roy. Soc. Med. 1974, 67, 30
- Howlett, P. V., Sheiner, H. J., Barber, D. C., Ward, A. S., Perez-Avila, C. A., & Duthie, H. L. Gut 1976, 17, 542
- Hunt, J. N., & Spurrell, W. R. J. Physiol. (Lond.) 1951, 113, 157
- Hydén, S. K. Lantbrukshoegsk. Ann. 1955, 22, 411
- Johansson, C. Monogr. Mount Sinai J. Med. 1976, 43, 45-57
- Jones, T., Clark, J. C., Kocak, N., Cox, A. G., & Glass, H. I. Brit. J. Radiol. 1970, 43, 537
- Kalbasi, H., Hudson, F. R., Herring, A., Moss, S., Glass, H. I., & Spencer, J. Gut 1975, 16, 509
- Lagerlöf, H. O., Ekelund, K., & Johansson, C. Scand. J. Gastroent. 1972, 7, 379
- Ostick, D. G., Green, G., Howe, K., Dymock, I. W., & Cowley, D. J., Gut 1976, 17, 189
- Snedecor, G. W., & Cochran, W. G. Statistical Methods, 6th ed. The Iowa State University Press, Ames, Iowa, USA, 1973
- Stauch, G. W., & Boettcher, I. Leber Magen Darm 1976, 6, 163
- van Dam, A. P. M. Radiology 1974, 110, 155