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2. Cooke, W. T., Peeney, A. L. P., and Hawkins, C. F. (1953).Quart. J. Med., 59, 85.
3. Cooke, W. T. and Brooke, B. N. (1955). Ibid., 24, 1.
4. Cooke, W. T. (1955). Hunterian Lecture, London.
5. Glazier, I., and Adlersberg, D. (1953).Gastro-enterology, 24, 159.