1. Fried LP, Tangen CM, Walston J, Newman AB, Hirsch C, Gottdiener J, et al. 1. He, W., M.N. Muenchrath, and P. Kowal, Wan He, Mark N. Muenchrath, and Paul Kowal, U.S. Census Bureau, Shades of Gray: A Cross-Country Study of Health and Well-Being of the Older Populations in SAGE Countries, 2007–2010, U.S. Government Printing Office, Washington, DC, 2012.
2. Clegg, A., et al., Frailty in elderly people. The Lancet, 2013. 381(9868): p. 752–762.
3. Hilmer, S.N. and D. Gnjidic, Frailty: Chapter 12. In: Caplan G. ed. Geriatric Medicine: An Introduction. IP Communications, 2014:189–201.
4. Rolfson, D.B., et al., Validity and reliability of the Edmonton Frail Scale. Age and Ageing, 2006. 35(5): p. 526–529.
5. Collard, R.M., et al., Prevalence of frailty in community-dwelling older persons: A systematic review. Journal of the American Geriatrics Society, 2012. 60(8): p. 1487–1492.