Abstract
References
1.
Cluff
L E
Canter
A
Imboden
J B
. (1966 ) Archives of Internal Medicine
117 , 159
2.
Essen-Möller
E
. (1956 ) Acta psychiatrica et neurologica Scandinavica
Suppl. 100
3.
Hagnell
O
. (1966 ) Annals of the New York Academy of Sciences
125 , 846
4.
Russell
W T
Whitwell
G P B
Ryle
J A
. (1947 ) British Journal of Industrial Medicine
4 , 56
5.
Semmence
A
. (1969 ) Journal of the Royal College of General Practitioners
17 , 304