Research Article

How to do it. Organise a multicentre trial.

BMJ 1990; 300 doi: https://doi.org/10.1136/bmj.300.6718.180 (Published 20 January 1990) Cite this as: BMJ 1990;300:180

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

PDF extract preview