Letters, Notes, and AnswersBMJ 1917; 1 doi: http://dx.doi.org/10.1136/bmj.1.2931.316 (Published 03 March 1917) Cite this as: BMJ 1917;1:316
Log in using your username and password
Log in through your institution
Register for a free trial to thebmj.com to receive unlimited access to all content on thebmj.com for 14 days.
Sign up for a free trial