[1] Vanderbilt Univ, Sch Med, Dept Anesthesiol, Nashville, TN 37212 USA
[2] Northwestern Univ, Sch Med, Dept Physiol, Chicago, IL 60611 USA
[3] Univ Washington, Sch Med, Dept Anesthesiol & Pain Med, Seattle, WA USA
[4] NIH, Pain & Palliat Care Serv, Ctr Clin, Bethesda, MD 20892 USA
[5] Harvard Univ, Sch Med, Dept Psychiat, Boston, MA 02115 USA
[6] NIA, NIH, Bethesda, MD 20892 USA
[7] Univ Penn, Sch Med, Dept Biostat & Epidemiol, Philadelphia, PA 19104 USA
[8] Johns Hopkins Univ, Sch Med, Dept Psychiat & Behav Sci, Baltimore, MD 21205 USA
[9] Int Sever Informat Syst, Inst Clin Outcomes Res, Salt Lake City, UT USA
[10] Natl Inst Dent & Craniofacial Res, NIH, Bethesda, MD USA
[11] Cornell Univ, Weill Med Coll, Dept Pharmacol, New York, NY 10021 USA
[12] Univ Maryland, Sch Med, Dept Family & Community Med, Baltimore, MD 21201 USA
[13] Stanford Univ, Sch Med, Dept Anesthesia, Stanford, CA 94305 USA
[14] Harvard Univ, Sch Med, Dept Anesthesia, Boston, MA 02115 USA
[15] NIH, Natl Ctr Adv Translat Sci, Bethesda, MD 20892 USA
[16] NIAMSD, NIH, Bethesda, MD 20892 USA
[17] Harvard Univ, Sch Med, Dept Neurol & Neurobiol, Boston, MA USA
[18] Univ Michigan, Dept Psychiat, Mol & Behav Neurosci Inst, Ann Arbor, MI 48109 USA