1. JOERGENSON, E. J., and WEIBEL, L. A. (1951), Calif. Med., 75, 395.
2. LEWIS, D. L. (1939), Brit. J. Surg., 26, 540.
3. WILKIE, D. (1953), Ibid., 41, 50.
4. WILLIAMS, A. G., and FODDEN, J. H. (1946), Ibid., 34, 57.
5. MEYER, J. (1954), Amer. Rev. Tuberc., 70, 402.