[1] Cedars Sinai, Dept Med, Div Hlth Serv Res, Los Angeles, CA 90048 USA
[2] Amer Chron Pain Assoc, Rocklin, CA USA
[3] Res Solut Grp, Encinitas, CA USA
[4] Cedars Sinai, Dept Psychiat & Behav Hlth, Los Angeles, CA 90048 USA
[5] Penn State Univ, Coll Med, Hershey, PA USA
[6] Cedars Sinai, Dept Med, Div Gen Internal Med, Los Angeles, CA 90048 USA
[7] Cedars Sinai, Hlth Serv Res, Pacific Theatre Bldg,116 N Robertson Blvd,8th Floo, Los Angeles, CA 90048 USA