Department of Anesthesiology, University of California San Diego, San Diego, CA, United States

Corresponding author. Address: Department of Anesthesiology, UCSD, 214 Dickenson St, CTF C-303, San Diego, CA 92103, United States. E-mail address: gjbennett@ucsd.edu (G.J. Bennett).

Sponsorships or competing interests that may be relevant to content are disclosed at the end of this article.

Received February 17, 2018

Received in revised form March 16, 2018

Accepted March 21, 2018