Br Med J. 1971 Sep 18;3(5776):704-5. doi: 10.1136/bmj.3.5776.704-b.
British medical journal
J Pemberton
PMID: 5569562 PMCID: PMC1798968 DOI: 10.1136/bmj.3.5776.704-b Free PMC Article
[No abstract available.]