Br Med J (Clin Res Ed). 1985 Jun 29;290(6486):1985-6. doi: 10.1136/bmj.290.6486.1985.
British medical journal (Clinical research ed.)
[No authors listed]
PMID: 3924332 PMCID: PMC1416001 DOI: 10.1136/bmj.290.6486.1985 Free PMC Article
[No abstract available.]