Research Article
A rare type.
Br Med J (Clin Res Ed) 1985; 290 doi: https://doi.org/10.1136/bmj.290.6478.1327 (Published 04 May 1985) Cite this as: Br Med J (Clin Res Ed) 1985;290:1327This is a PDF-only article. The first page of the PDF of this article appears above.