TY - JOUR A1 - Fried, L.P. A1 - Ferrucci, L. A1 - Darer, J. A1 - Williamson, J.D. A1 - Anderson, G. T1 - Untangling the concepts of disability, frailty, and comorbidity: Implications for improved targeting and care Y1 - 2004 DO - 10.1093/gerona/59.3.M255 VL - 59 IS - 3 ER -