Further Reading

• Clegg A, Rogers L, Young J. Diagnostic test accuracy of simple instruments for identifying frailty in community-dwelling older people: a systematic review. Age and ageing 2015; 44: 148-152. • de Vries NM, Staal JB, van Ravensberg CD, et al. Outcome instruments to measure frailty: a systematic review. Ageing Res Rev 2011; 10: 104-114. • Hamaker ME, Jonker JM, de Rooij SE, et al. Frailty screening methods for predicting outcome of a comprehensive geriatric assessment in elderly patients with cancer: a systematic review. Lancet Oncol 2012; 13: e437-e444. • Handforth C, Clegg A, Young C, et al. The prevalence and outcomes of frailty in older cancer patients: a systematic review. Annals of Oncology: official journal of the

European Society for Medical Oncology / ESMO 2015; 26: 1091-1101. • Makary MA, Segev DL, Pronovost PJ, et al. Frailty as a predictor of surgical outcomes in older patients. J Am Coll Surg 2010; 210: 901-908. • Ommundsen N, Wyller TB, Nesbakken A, et al. Frailty is an independent predictor of survival in older patients with colorectal cancer. The Oncologist 2014; 19: 1268-1275. • Theou O, Rockwood K. Should frailty status always be considered when treating the elderly patient? Aging Health 2012; 8: 261-271. • Wallis SJ, Wall J, Biram RW, Romero-Ortuno R. Association of the clinical frailty scale with hospital outcomes. QJM: monthly journal of the Association of Physicians 2015; 108: 943-949.