TY - JOUR A1 - Olshansky, S.J. A1 - Ault, A.B. T1 - The fourth stage of the epidemiologic transition: The age of Delayed Degenerative Diseases Y1 - 1986 DO - 10.2307/3350025 JF - The Milbank Quarterly VL - 64 IS - 3 SP - 355 EP - -391 ER -