Full text
PDF
. 1913 May 31;1(2735):1145–1151. doi: 10.1136/bmj.1.2735.1145
Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.