@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},
URL = {10.2307/3350025},
journal = {The Milbank Quarterly},
volume = {64},
number = {3},
pages = {355--391},
}