<p>Continuing Education articles are run in conjunction with the Royal College of Nursing Institute to help you earn Continuing Education Points (CEPs). All you have to do is read through the article, follow the instructions in the Time Out boxes, then answer the assessment questions that follow. Fill in the answer sheet and return it to the Freepost address with your fee by July 10, 1997. This is an updated version of an article previously published in Nursing Standard. Readers who successfully completed an assessment on first publication may not do so again.</p>