@article{Steptoe2013,
author = {Steptoe, A. and Shankar, A. and Demakakos, P. and Wardle, J.},
title= {Social isolation, loneliness, and all-cause mortality in older men and women},
year = {2013},
doi = {10.1073/pnas.1219686110},
journal = {Proc Natl Acad Sci U S A},
volume = {110},
number = {15},
pages = {5797−5801},
}