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On page 2793 in the 18 May 2017 issue, under “Disclosures,” Laurie H. Sehn is incorrectly cited as the article’s Associate Editor. Thomas L. Ortel should be cited as the Associate Editor with the disclosure, “Associate Editor Thomas L. Ortel served as an advisor or consultant for Instrumentation Laboratory.” The publisher apologizes for this error. Also, in the Acknowledgments section on page 2799, the sentence “The assistance of Robin Cox and the Division of Pediatric Anesthesia at the Alberta Children's Hospital in facilitating the collection of control blood samples is gratefully acknowledged” is missing. The errors have been corrected in the online version, which now differs from the print version.