[1] Univ Arizona Hlth Sci, Comprehens Pain & Addict Ctr, Tucson, AZ USA
[2] Univ Arizona, Arizona Ctr Rural Hlth, Mel & Enid Zuckerman Coll Publ Hlth, Tucson, AZ USA
[3] Western Michigan Univ, Coll Hlth & Human Serv, Sch Interdisciplinary Hlth Programs, Kalamazoo, MI USA
[4] Univ Arizona, Coll Med, Dept Anesthesiol, Tucson, AZ USA
[5] Univ Arizona, Mel & Enid Zuckerman Coll Publ Hlth, Dept Epidemiol & Biostat, Tucson, AZ USA
[6] Univ Arizona, Coll Med, Dept Family & Community Med, Tucson, AZ USA
[7] Univ Arizona, Coll Med, Dept Pharmacol, Tucson, AZ USA
[8] Comprehens Pain & Addict Ctr, POB 245050, Tucson, AZ 85724 USA