Articles
Reviews
Br Med J 1934; 1 doi: https://doi.org/10.1136/bmj.1.3824.715 (Published 21 April 1934) Cite this as: Br Med J 1934;1:715This is a PDF-only article. The first page of the PDF of this article appears above.
Intended for healthcare professionals
This is a PDF-only article. The first page of the PDF of this article appears above.