From the *Newcastle University Medical School, Newcastle upon Tyne, United Kingdom
†Department of Anesthesiology, Division of Critical Care Medicine, Vanderbilt University Medical Center, Nashville, Tennessee
‡Department of Electrical and Computer Engineering, McGill University, Montreal, Quebec, Canada.
Published ahead of print 23 May 2019.
Accepted for publication May 23, 2019.
The authors declare no conflicts of interest.
Reprints will not be available from the authors.
Address correspondence to Joseph J. Schlesinger, MD, Department of Anesthesiology, Division of Critical Care Medicine, Vanderbilt University Medical Center, 1211 21st Ave S, Medical Arts Building, Suite 422, Nashville, TN 37212. Address e-mail to firstname.lastname@example.org.