. Author manuscript; available in PMC: 2014 Jan 28.
Published in final edited form as: Am J Infect Control. 2013 Jul 20;41(11):959–964. doi: 10.1016/j.ajic.2013.04.008
Copyright © 2013 by the Association for Professionals in Infection Control and Epidemiology, Inc. Published by Elsevier Inc. All rights reserved.