REFERENCES
- Arnold, D. J. Amer. J. Surg. 1970, 119, 714–717
- Aukee, S., Alhava, E. M., Lahtinen, J., Salmela, J. & Sipilä, S. Duodecim (Helsinki) 1976, 92, 881–888
- Braasch, J. W., Wheeler, W. M. & Colcock, B. P. Surg. Clin. N. Amer. 1964, 44, 707–717
- Burnett, W. The Practitioner 1972, 209, 150–156
- Carlsen, J. E., Lauritzen, T., Hermann, K. J. C. & Hansen, P. H. Acta Chir. Scand. 1977, 143, 47–48
- Editorial. Brit. Med. J. 1975, 13, 607–608
- Editorial. Lancet 1976, I, 182–183
- Edlund, Y. & Olsson, O. Acta Chir. Scand. 1961, 120, 479–494
- Edlund, Y., Eldh, J. & Kock, N. G. Acta Chir. Scand. 1972, 138, 176–178
- Ellis, H. & Cronin, K. Brit. J. Surg. 1960, 48, 166–171
- Essenhigh, D. M. Brit. J. Surg. 1966, 53, 1032–1038
- Freund, H. R. Amer. J. Surg. 1951, 82, 703–708
- Gagic, N., Frey, C. F. & Gaines, R. Surg. Gynec. Obstet. 1975, 140, 868–874
- Gardner, B., Ostrowitz, A. & Masur, R. Surgery 1971, 69, 854–857
- Gardner, R. E., Jew, J. & Goldman, L. Amer. J. Surg. 1961, 102, 191–195
- Glenn, F. & Thorbjarnarson, B. Surg. Gynec. Obstet. 1963, 116, 61–70
- Halasz, N. A. Amer. J. Surg. 1975, 130, 189–192
- Hall, R. C., Sakiylak, P., Kim, S. K., Rogers, L. S. & Webb, W. R. Amer. J. Surg. 1973, 125, 51–63
- Hicken, N. F. & McAllister, A. J. Surgery 1964, 55, 753–758
- Hilton, H. D. & Griffin, W. T. Postgrad. Med. J. 1970, 47, 120–124
- Hofmann, A. F. & Paumgartner, G. Progress Report 1975. Schattauer Verlag, Stuttgart
- Horwitz, A., McCorkle, R. G. & Seymour, A. Med. Ann. D.C. 1953, 22, 127–132
- Jersky, J. S. Afr. J. Surg. 1970, 8, 41–45
- Kakkar, V. V., Field, E. S., Nicolaides, A. N., Flute, P. T., Wessler, S. & Yin, E. T. Lancet 1971, II, 669–671
- Lansford, C., Mehta, S. & Kern, F. Gut 1974, 15, 48–51
- Lindahl, F. & Cederqvist, C. S. Acta Chir. Scand. Suppl. 1969, 398 9
- van der Linden, W. & Sunzel, H. Amer. J. Surg. 1970, 120, 7–13
- McDonald, J. A. Canad. Med. Ass. J. 1974, 65, 797–799
- McArthur, P., Cuschieri, A., Sells, R. A. & Shields, R. Brit. J. Surg. 1975, 62, 850–852
- Meeker, W. R. Sth. Med. J. (Bgham., Ala.) 1972, 65, 801–806
- Meyer, K. A., Capos, N. J. & Mittelpunkt, A. A. Surgery 1967, 61, 661–668
- Payne, R. A. Brit. J. Surg. 1969, 56, 200–203
- Penttilä, I. M., Jokela, H. A., Viitala, A. J., Heikkinen, E., Nummi, S., Pystynen, P. & Saastamoinen, J. Scand. J. Clin. Lab. Invest. 1975, 35, 275–284
- du Plessis, D. J. & Jersky, J. Surg. Clin. N. Amer. 1913, 53, 1071–1077
- Pines, P. & Rabinowitch, J. Ann. Surg. 1954, 140, 170–179
- Raine, P. A. M. & Gunn, A. A. Brit. J. Surg. 1975, 62, 697–700
- Rosi, P. A. & Midell, A. I. Surg. Clin. N. Amer. 1967, 47, 147–156
- Ross, F. P., Boggs, J. D. & Dunphy, J. E. Surg. Gynec. Obstet. 1950, 91, 271–276
- Seiro, V. & Kettunen, K. Acta Chir. Scand. 1965, 129, 96–103
- Seiro, V. & Kettunen, K. Acta Chir. Scand. 1967, 133, 320–322
- Seiro, V. & Köhler, R. Acta Chir. Scand. 1960, 119, 411–416
- Sokhi, G. S. & Longland, C. J. Brit. J. Surg. 1973, 60, 937–939
- Strohl, E. L., Diffenbaugh, W. G., Baker, J. H. & Cheema, M. H. Surg. Gynec. Obstet. 1962, 114, 1–7
- Stuart, L. G. Brit. Med. J. 1948, 2, 241–243
- Vuori, E. E. Amer. J. Surg. 1976, 132, 75–80
- Watkin, D. F. L. & Thomas, G. G. Brit. J. Surg. 1911, 58, 570–573
- Wenckert, A. & Hallgren, T. Acta Chir. Scand. 1969, 135, 701–706
- Wenckert, A. & Robertson, B. Gastroenterology 1966, 50, 376–381
- Whitehouse, W. M. pp. 933–959 in Margulis, A. R. & Burhenne H. J. (eds.) Alimentary Tract Roentgenology. St. Louis, C. V. Mosby Co. 1967
- Wiechel, K-L. Acta Chir. Scand. Suppl. 1964, 330 1
- Wright, H. K. & Holden, W. D. Arch. Surg. 1960, 81, 341–347