Gambassi G., Lapane K.L, Landi F., Sgadari A., Mor V., Bernabei R..  1999.  Gender differences in the relation between comorbidity and mortality of patients with Alzheimer's disease. Neurology. 53(3):508-516.

Carpenter G.I, Turner G.F, Fowler R.W, Bray P., Carpenter B., Dickinson E.J, Gonsalkorale M., Main A., McElligott G., Morris S. et al..  1997.  Casemix for inpatient care of elderly people: Rehabilitation and post-acute care. Age & Ageing. 26(2):123-131.

Tsay T., Shugrue N., Charles D., Migneault D., McManus R., Gruman C., Robison J..  2022.  Predictors of Frailty Change in Home and Community-Based Services Populations. Journal of the American Medical Directors Association. 23(5):838-844.

Newland P.K, Wipke-Tevis D.D, Williams D.A, Rantz M.J, Petroski G.F.  2005.  Impact of pain on outcomes in long-term care residents with and without multiple sclerosis. Journal of the American Geriatrics Society. 53(9):1490-1496.