Abstract

References
1.
Langley
G. W.
Platt
R.
(1947 ) Quart. J. Med. , 16 , 143 .
2.
Pickering
G. W.
Heptinstall
R. N.
(1953 ) Quart. J. Med. , 22 , 1 .
3.
Van de Goidsendoven
F.
Vandenbrouck
E. J.
(1946 ) Pr. méd. , 54 , 52 .
