Vitamin D in the prevention of exacerbations of asthma in preschoolers (DIVA): protocol for a multicentre randomised placebo-controlled triple-blind trial by Mohsen Sadatsafavi, Megan E Jensen, Francine M Ducharme, Nathalie Alos, Geneviève Mailhot, Benoît Mâsse, John H White, Ali Khamessan, Sze Man Tse, Reza Alizadehfar, Dirk E Bock, Patrick Daigneault, Chantal Lemire, Connie Yang, Dhenuka Radhakrishnan

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