The authors have retracted this article because they have discovered that the FlexiVent data (pulmonary mechanics) reported in Fig. 2 are not reliable. This has been confirmed by an investigation by the Duke University Office of Scientific Integrity. As the FlexiVent data reported in Fig. 2 represent the main finding of the article, the authors concluded that it is appropriate to retract this article. Authors Chang Won Choi, Beyong Il Kim, Mulugu V. Brahmajothi, and Richard L. Auten agree with this retraction. Stanley N. Mason and Erin N. Potts-Kant could not be reached for comment. The authors regret any inconvenience caused to the journal and the research community.