作者单位:VA Pittsburgh Healthcare Syst VAPHS, Ctr Hlth Equ Res & Promot, Pittsburgh, PA USA[1]Univ Arizona, Coll Med, Tucson, AZ USA[2]Univ Pittsburgh, Sch Med, Pittsburgh, PA USA[3]Cornell Univ, Dept Healthcare Policy & Res, Weill Cornell Med, New York, NY 10021 USA[4]Corporal Michael J Crescenz VA Med Ctr, CHERP, Philadelphia, PA USA[5]