Departments of ^aPsychiatry and Behavioral Sciences and

^bAnesthesiology and Pain Medicine, University of Washington, Seattle, WA, USA

Corresponding author. Address: Psychiatry and Behavioral Sciences, University of Washington, Box 356560, Seattle, WA 98195, USA. Tel.: (206) 685-3184; fax: (206) 221-5414. E-mail address: [email protected] (M. D. Sullivan).

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

Received May 17, 2015

Received in revised form July 24, 2015

Accepted August 12, 2015