Best Practice is a column from the Joanna Briggs Institute (JBI), Adelaide, South Australia ( www.joannabriggs.edu.au ), that appears periodically in AJN . This installment is based upon a systematic literature review conducted by the Norwegian Centre for Health Technology Assessment, Oslo (Kjonniksen I, et al. AORN J 2002;75(5): 928–38, 940). It is adapted with permission from the original text developed by Craig Lockwood and Tamara Page of the Centre for Evidence-based Nursing South Australia, a collaborating center of JBI, that appeared in Best Practice 2003;7(2):1–6. While care has been taken to ensure that this article summarizes available research and expert consensus, the Institute has not conducted a formal update since the original publication, and no liability can be accepted as a result of reliance on the procedures described.