1. Aidin, R., Corner, B. and Tovey, G. (1950). Lancet, 1, 1153.
2. Black-Schaffer, B., Kambe, S., Furuta, M. and Moloney, W. C. (1954). Amer. J. Dis. Child., 87, 737.
3. Cathie, I. A. B. (1946). Archives of Disease in Childhood, 21, 229.
4. Claireaux, A. (1950). Ibid., 25, 71.
5. Craig, J. M. and Landing, B. H. (1952). A.M.A. Arch. Path., 54, 321.