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Slinin, Y.; Paudel, M.; Taylor, B. C.; Ishani, A.; Rossom, R.; Yaffe, K.; Blackwell, T.; Lui, L.-Y.; Hochberg, M.; Ensrud, K. E. . (2012). Association Between Serum 25(OH) Vitamin D and the Risk of Cognitive Decline in Older Women. The Journals of Gerontology Series A: Biological Sciences and Medical Sciences, 67(10), 1092–1098. doi:10.1093/gerona/gls075 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research