Br Med J. 1939 Oct 07;2(4109):720-1. doi: 10.1136/bmj.2.4109.720.
British medical journal
S Davidson, J D Sutherland
PMID: 20782685 PMCID: PMC2177993 DOI: 10.1136/bmj.2.4109.720
[No abstract available.]