1. National Institute on Aging and World Health Organization. Global Health and Aging. 2011. Available at: https://www.nia.nih.gov/research/publication/global-health-and-aging/living-longer. Accessed June 15, 2017.
2. An aging world: 2015. International population reports, P95/16–1;He,2016
3. Frailty and failure to thrive;Fried,1998
4. Frailty in older adults: a nationally representative profile in the United States;Bandeen-Roche;J Gerontol A Biol Sci Med Sci,2015
5. Frailty and geriatric syndromes;Xue,2017