Research Article Editorial: N.H.S. family planning. Br Med J 1974; 1 doi: http://dx.doi.org/10.1136/bmj.1.5904.342 (Published 02 March 1974) Cite this as: Br Med J 1974;1:342 Article Related content Metrics Responses Peer review This article has a correction. Please see:Chromosome damage produced by psoralen and ultraviolet light - February 28, 1976 This is a PDF-only article. The first page of the PDF of this article appears below.