Research Article

Whistle for your wind.

Br Med J (Clin Res Ed) 1984; 289 doi: http://dx.doi.org/10.1136/bmj.289.6443.449 (Published 25 August 1984) Cite this as: Br Med J (Clin Res Ed) 1984;289:449

This is a PDF-only article. The first page of the PDF of this article appears below.

PDF extract preview