Abstract
References
1.
Asher
R
(1951 ) Lancet
i , 339 .
2.
Bush
A
Collins
J V
(1982 ) Postgraduate Medical Journal
58 , 564 –565 .
3.
Feinsilver
S J
Raffin
T A
Korner
M C
Sullivan
S J
Smith
M A
(1983 ) Archives of Internal Medicine
143 , 567 –568 .
4.
Roethe
R A
Fuller
P B
Byrd
R B
Stanford
W
Fisk
D E
(1981 ) Chest
79 , 487 –488 .
5.
Spiro
H R
(1968 ) Archives of General Psychiatry
18 , 569 –579 .