1 The University of Chicago Medicine, Chicago, IL.
Received 24 October 2018.
Accepted 26 October 2018.
The authors declare no funding or conflicts of interest.
Both authors contributed to the writing of the article.
Correspondence: Michael Charlton, MD, FRCP, The University of Chicago Medicine 5841 S. Maryland Ave, Chicago, IL 60637. (firstname.lastname@example.org).