Abstract
References
1.
Lumsden
K
Traelove
S C
. (1959 ) Brit. J. Radiol.
32 , 517 .
2.
Morson
B
. (1963 ) Brit. J. Radiol.
36 , 385 .
3.
Strdm
B G
Winberg
T
. (1962 ) Acta radiol., Stockh.
57 , 401 .
4.
Welin
S
. (1958 ) Brit. J. Radiol.
31 , 369 .
5.
Young
A C
. (1963 ) Proc. R. Soc. Med.
56 , 491 .