Fried LP, Tangen CM, Walston J, Newman AB, Hirsch C, Gottdiener J, Seeman T, Tracy R, Kop WJ, Burke G, et al. Frailty in older adults: evidence for a phenotype. J Gerontol A Biol Sci Med Sci. 2001  ;56(3):M146-56.

Olson NC, Butenas S, Lange LA, Lange EM, Cushman M, Jenny NS, Walston J, Souto JC, Soria JM, Chauhan G, et al. Coagulation factor XII genetic variation, ex vivo thrombin generation, and stroke risk in the elderly: results from the Cardiovascular Health Study. J Thromb Haemost. 2015  ;13(10):1867-77.