1. Bauer, W., Clark, W. S., and Kulka, J. P. (1951). Ann. rheum. Dis., 10, 470.
2. In discussion on;Bennett, G.A.,1951
3. Bernstein, L., and Broch, 0. J. (1949). Acta. med. Scand., 135, 185.
4. Bywaters, E. G. L. (1950). Brit. Heart J., 12, 101.
5. Clark, W., Kulka, J. P., and Bauer, W. (1957). Amer. J. Med., 22, 560.