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Amrein, Karin; Parekh, Dhruv; Westphal, Sabine; Preiser, Jean-Charles; Berghold, Andrea; Riedl, Regina; Eller, Philipp; Schellongowski, Peter; Thickett, David; Meybohm, Patrick (2019). Effect of high-dose vitamin D3 on 28-day mortality in adult critically ill patients with severe vitamin D deficiency: a study protocol of a multicentre, placebo-controlled double-blind phase III RCT (the VITDALIZE study). BMJ open, 9(11), e031083. BMJ Publishing Group 10.1136/bmjopen-2019-031083
