@techreport{Engelman2013,
author = {Engelman, M. and Canudas-Romo, V. and Agree, E.M.},
title= {Frailty in transition: Vulnerability and variation in aging populations},
year = {2013},
publisher = {Madison, Wisconsin: Center for Demography and Ecology},
number = {CDE Working Paper No. 2013-10},
}