Varadhan R, Yao W, Matteini A, Beamer BA, Xue Q-L, Yang H, Manwani B, Reiner A, Jenny N, Parekh N, et al. Simple biologically informed inflammatory index of two serum cytokines predicts 10 year all-cause mortality in older adults. J Gerontol A Biol Sci Med Sci. 2014 ;69(2):165-73.