@article{K.M.2009,
author = {Langa, K.M. and Llewellyn, D.J. and Land, I.A. and Weir, D.R. and Wallace, R.B.},
title = {Cognitive health among older adults in the US and in England},
journal = {BMC Geriatrics},
year = {2009},
month = {Jan},
volume = {9},
number = {23},
url = {},
}