Clinical Meeting Held at the Hospital for Sick Children,Great Ormond Street,London,on February 26,1943

Benjamin B. Childe A. E. (1939) J. Pediat., 15, 621.

Lister G. (1941) Am. J. Dis. Child., 62, 613.

Pierce C. B. Dirkse P. R. (1937) Radiology, 28, 651.