TY - JOUR AU - Van Den, N. N. PY - 1999 DA - 1999// TI - Intensive care for very elderly patients: outcome and risk factors for in-hospital mortality JO - Age Ageing VL - 28 UR - https://doi.org/10.1093/ageing/28.3.253 DO - 10.1093/ageing/28.3.253 ID - Van Den1999 ER - TY - JOUR AU - Katz, S. PY - 1963 DA - 1963// TI - Studies of illness in the aged. The index of ADL: a standardized measure of biological and psychosocial function JO - JAMA VL - 185 UR - https://doi.org/10.1001/jama.1963.03060120024016 DO - 10.1001/jama.1963.03060120024016 ID - Katz1963 ER -