Social and clinical determinants of preferences and their achievement at the end of life: prospective cohort study of older adults receiving palliative care in three countries oleh Irene J. Higginson, Barbara A. Daveson, R. Sean Morrison, Deokhee Yi, Diane Meier, Melinda Smith, Karen Ryan, Regina McQuillan, Bridget M. Johnston, Charles Normand, on behalf of BuildCARE