Preliminary cost-effectiveness of vitamin D3 supplementation in older adults with vitamin D deficiency (defined by serum 25-hydroxyvitamin D) in Ireland. Issue 3 (2021) - Lacey, L.F.; Armstrong, D.J.; Magee, P.J.; McSorley, E.M.; Pourshahidi, L.K.; Ray, S.; Strain, J.J.; Royle, E.