Abstract

References
1.
Black
M M
(1971 ) Transactions of the St John's Hospital Dermatological Society
57 , 177
2.
Black
M M
(1974 ) British Journal of Dermatology
9 , Suppl 10 , p 42
3.
Danielsen
L
Christensen
H E
Wanstrup
J
(1970 ) Acta pathologica et microbiologica Scandinavica A
78 , 335
