Abstract

References
1.
Cronin
E
(1966 ) Trans. St John's Hosp. derm. Soc. (Lond.)
52 , 44
2.
Lehner
T
(1964 ) Lancet
ii , 1154
3.
Marks
J
Shuster
S
Watson
A J
(1966 ) Lancet
ii , 1280
4.
Winstock
D
(1962 ) Brit. J. Derm . 74 , 431
