Lindstedt, Isak, et al. “Lower Mortality in Very Elderly Patients and Heart Failure Patients Admitted to the Hospital Having High Blood Pressure”. Cardiology and Cardiovascular Medicine, vol. 3, no. 4, Aug. 2019, pp. 204-20, http://www.fortunejournals.org/ojs/index.php/ccm/article/view/15688.