Effective Health Care is an independent report based on systematic reviews of the research evidence, produced by the NHS centre for reviews and dissemination, York University. The bulletin aims to provide NHS decision makers with information on the effectiveness of interventions and the delivery and organisation of healthcare.

For more information, phone 01904-433648 or e-mail revdis@york.ac.uk Effective Health Care is available on the web at www.york.ac.uk/inst/crd/ehcb.htm