Proof of HarmlessnessBr Med J 1957; 2 doi: https://doi.org/10.1136/bmj.2.5042.456 (Published 24 August 1957) Cite this as: Br Med J 1957;2:456
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