<p>This information on best practice is based on a systematic review (Callaghan et al 2005) conducted by the Institute Nurses' Network (Telethon Institute of Child Health Research), Western Australian community and child health nurses and the Western Australian Centre for Evidence Based Nursing and Midwifery, a collaborating centre of the Joanna Briggs Institute. The primary references on which this information is based are 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;