1. Bayley, R. H. and Fader, D. E. (1941). Amer. Heart J., 21, 238.
2. Edmunson, H. N. and Hoxie, H. J. (1942). Ibid., 24, 719.
3. Gross, H. and Schwartz, S. P. (1936). Ibid., 11, 626.
4. Moulten, S. E. (1942). Arch. intern. Med., 69, 108.
5. Sager, R. V. (1934). Ibid., 53, 140.