@article{Olshansky1986,
author = {Olshansky, S.J. and Ault, A.B.},
title= {The fourth stage of the epidemiologic transition: The age of Delayed Degenerative Diseases},
year = {1986},
doi = {10.2307/3350025},
journal = {The Milbank Quarterly },
volume = {64},
number = {3},
pages = {355--391},
}