Correspondence

Masks or Silence

Br Med J 1960; 1 doi: https://doi.org/10.1136/bmj.1.5186.1653-a (Published 28 May 1960) Cite this as: Br Med J 1960;1:1653

This is a PDF-only article. The first page of the PDF of this article appears below.

PDF extract preview

Sign in

Log in through your institution

Subscribe