1. Scientific Resource Center for the AHRQ Evidence-based Practice Center Program, Portland VA Research Foundation, and VA Portland Health Care System, Portland, Oregon (I.A., C.A., E.G., R.A.P.)
2. Scientific Resource Center for the AHRQ Evidence-based Practice Center Program, Portland VA Research Foundation, VA Evidence Synthesis Program, and VA Portland Health Care System, Portland, Oregon (M.H.)
3. VA Evidence Synthesis Program and VA Portland Health Care System, Portland, Oregon (J.A., K.M.)