TY - JOUR A1 - Wolff, J.L. A1 - Mulcahy, J. A1 - Huang, J. A1 - Roth, D.L. A1 - Covinsky, K. A1 - Kasper, J.D. T1 - Family caregivers of older adults, 1999–2015: Trends in characteristics, circumstances, and role-related appraisal Y1 - 2018 DO - 10.1093/geront/gnx093 VL - 58 IS - 6 ER -