Abstract
References
1.
Halpern
D
Meelhuysen
F E
. (1966 ) Arch. phys. Med.
47 , 659 .
2.
Khalili
A A
Betts
H B
. (1967 ) J. Amer. med. Ass.
200 , 1155 .
3.
Meelhuysen
F E
Halpern
D
Quast
J
. (1968 ) Arch. phys. Med.
49 , 717 .
4.
Nathan
P W
. (1965 ) Brit. med. J.
i , 1096 .