<p>This information on best practice is based on a systematic review of research, published by Blackwell Publishing Asia and conducted by the Centre for Evidence-based Nursing South Australia, a collaborating centre of the Joanna Briggs Institute (JBI). The primary references on which this information is based are provided in the systematic review report available online via Blackwell Synergy www.blackwell-synergy.com and to members of the institute via the web site www.joannabriggs.edu.au</p&gt; <p>This information sheet covers the following:</p>