Cross-sectional associations of plasma vitamin D with cerebral β-amyloid in older adults at risk of dementia. Alzforum, 04 May 2018 Nourhashemi F, Hooper C, Cantet C, Féart C, Gennero I, Payoux P, Salabert AS, Guyonnet S, De Souto Barreto P, Vellas B…