aDepartment of Psychology, Arizona State University, Tempe, AZ, USA
bDepartment of Anesthesiology, Perioperative and Pain Medicine, Stanford University Medical Center, Stanford, CA, USA
Sponsorships or competing interests that may be relevant to content are disclosed at the end of this article.
Received April 28, 2016
Received in revised form May 09, 2016
Accepted May 10, 2016