From the Department of Medical Engineering, California Institute of Technology, Pasadena, California.
Accepted for publication August 23, 2017.
The author declares no conflicts of interest.
Reprints will not be available from the author.
Address correspondence to Marie E. Csete, MD, PhD, Caltech Medical Engineering, 1200 E California Blvd, Pasadena, CA 91125. Address e-mail to firstname.lastname@example.org.