Effect of a test-and-treat approach to vitamin D supplementation on risk of all cause acute respiratory tract infection and covid-19: phase 3 randomised controlled trial (CORONAVIT)

Effect of a test-and-treat approach to vitamin D supplementation on risk of all cause acute respiratory tract infection and covid-19: phase 3 randomised controlled trial (CORONAVIT)
Jolliffe et al., BMJ, doi:10.1136/bmj-2022-071230 (preprint 3/23/2022)
https://c19early.org/jolliffe2.html