1. Aikawa, J. K.Current Diagnosis (1966). Ed. by Conn, H. F., Clohecy, R. J. and Conn, R. B. Saunders, Philadelphia and London.
2. Day, L., Wood, E. A. and Lane, W. F. (1946).J.R.A.M.C., 86, 58.
3. Drury, M. I. (1957).Irish J. Med. Sc., 7, 84.
4. Dunn, F. L. and Audy, J. R.Current Diagnosis and Treatment (1967). Ed. by Brainerd, H., Margen, S. and Chatton, M. J. Lange, Los Altos, California.
5. J. Am. Med. Ass. (1965), 193, 954.