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Example of a notable difference between one‐stage and two‐stage IPDMA results, as reported by Martineau et al. 31 who synthesise IPD from 25 randomised controlled trials (10,933 participants) to examine whether Vitamin D supplementation prevented acute respiratory tract infections. Case study and figure originally shown by Riley et al. 29 [Colour figure can be viewed at wileyonlinelibrary.com]
