1. Di Sant'Agnese, P. A. (1955). Pediatrics, 15, 683.
2. Darling, R. C., Perera, G. A. and Shea, E. (1953). Ibid., 12, 549.
3. Kessler, W. R. and Andersen, D. H. (1951). Ibid., 8, 648.
4. Shwachman, H., Leubner, H. and Catzel, P. (1955). Advances in Pediatrics, Vol. VII, p. 249.
5. Silverman, F. N. and Shirkey, H. C. (1955). Pediatrics, 15, 143.