1. Frailty and its definition;Rockwood;A worthy challenge,2005
2. Untangling the concepts of disability, frailty, and comorbidity;Fried;Implications for improved targeting and care,2004
3. Frailty in older adults;Fried;Evidence for a phenotype,2001
4. Frailty;Woods;Emergence and consequences in women aged 65 and older in the Women's Health Initiative Observational Study,2005
5. Phenotype of frailty;Bandeen-Roche;Characterization in the women's health and aging studies,2006