1. Models, definitions, and criteria of frailty;Hogan;Aging Clin Exp Res,2003
2. Clinical Global Impression of Change in Physical Frailty;Studenski;Development of a measure based on clinical judgment,2004
3. A global clinical measure of fitness and frailty in elderly people;Rockwood;Can Med Assoc J,2005
4. Frailty and its definition;Rockwood;A worthy challenge,2005
5. Untangling the concepts of disability, frailty, and comorbidity;Fried;Implications for improved targeting and care,2004