. Author manuscript; available in PMC: 2014 Aug 10.
Published in final edited form as: Anesthesiology. 2009 May;110(5):1086–1091. doi: 10.1097/ALN.0b013e3181a1081d
Copyright © 2009, the American Society of Anesthesiologists, Inc. Lippincott Williams & Wilkins, Inc.