Br Med J. 1966 Jul 30;2(5508):251-2. doi: 10.1136/bmj.2.5508.251.
British medical journal
[No authors listed]
PMID: 5945549 PMCID: PMC1943269 DOI: 10.1136/bmj.2.5508.251 Free PMC Article
[No abstract available.]