Negative ResponseBr Med J 1972; 3 doi: https://doi.org/10.1136/bmj.3.5826.584 (Published 02 September 1972) Cite this as: Br Med J 1972;3:584
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