@article{Willis2012,
author = {Willis, B.L. and Gao, A. and Leonard, D. and DeFina, L.F. and Berry, J.D.},
title= {Midlife fitness and the development of chronic conditions in later life},
year = {2012},
doi = {10.1001/archinternmed.2012.3400},
journal = {Archives of Internal Medicine},
volume = {172},
number = {17},
pages = {1333‒1340},
}