Gambassi G, Lapane K, Sgadari A, Landi F, Carbonin P, Hume A, Lipsitz L, Mor V, Bernabei R. Prevalence, clinical correlates, and treatment of hypertension in elderly nursing home residents. SAGE (Systematic Assessment of Geriatric Drug Use via Epidemiology) Study Group. Arch Intern Med. 1998 Nov 23; 158(21):2377-85.