Hu, Y. ., Leinonen, T. ., Myrskylä, M. ., & Martikainen, P. . (2018). Changes in Socioeconomic Differences in Hospital Days With Age: Cumulative Disadvantage, Age-as-Leveler, or Both?. The Journals of Gerontology. Series B, Psychological Sciences and Social Sciences. https://doi.org/10.1093/geronb/gbx161 (Original work published 2018)