1. McCain, P. P.: Journal-Lancet, 54:182, April 1, 1934.
2. Fellows, H. H.: Am. J. Med. Sc., 188:533, October, 1934.
3. Heise, F. H.: Canad. M. A. J., July, 1928.
4. Miller and Southerland: Am. J. Med. Sc., 188: 738, November, 1934.
5. Queries and Minor Notes: Jour. A. M. A., 108:18:1559, May 1, 1937.