Br Med J. 1968 Oct 05;4(5622):48-51. doi: 10.1136/bmj.4.5622.48.
British medical journal
J A Hopson
PMID: 4877880 PMCID: PMC1912063 DOI: 10.1136/bmj.4.5622.48 Free PMC Article
[No abstract available.]