. Author manuscript; available in PMC: 2013 Dec 4.
Published in final edited form as: J Pain Symptom Manage. 2013 Jun 4;46(6):10.1016/j.jpainsymman.2013.02.012. doi: 10.1016/j.jpainsymman.2013.02.012
© 2013 U.S. Cancer Pain Relief Committee. Published by Elsevier Inc. All rights reserved.