Br Med J. 1975 Sep 27;3(5986):788. doi: 10.1136/bmj.3.5986.788-a.
British medical journal
I M Richardson, J S Berkeley
PMID: 20792217 PMCID: PMC1674687 DOI: 10.1136/bmj.3.5986.788-a
[No abstract available.]