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2. Arends, T., Coonrad, E. V., and Rundles, R. W. (1954). Ibid., 16, 833.
3. Azar, H. A., Hill, W. T., and Osserman, E. F. (1957). Ibid., 23, 239.
4. Barnett, A. J., Curtain, C. C., Hayes, R. A., Holden, H. F., Pye, J., and O'Donnell, I. (1956). Aust. Ann. Med., 5, 177.
5. Buffa, F., and Rappaport, H. (1957). Amer. J. Med., 22, 504.