Abstract
References
1.
Eastwood
H D
Williams
T J
, (1973 ) Postgraduate Medical Journal
49 , 364 –365
2.
Hiller
E
Rosenow
E C
III
Olsen
A M
, (1972 ) Chest
61 , 452
3.
Samman
P D
White
W F
, (1964 ) British Journal of Dermatology
76 , 153