Circulating Vitamin D Levels and Alzheimer's Disease: A Mendelian Randomization Study in the IGAP and UK Biobank. Wang L, Qiao Y, Zhang H, Zhang Y, Hua J, Jin S, Liu G J Alzheimers Dis. 2020; 73(2):609-618. PMID: 31815694. Abstract Comment Bookmark Recommend Follow Comment | Bookmark | Recommend | Follow