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healthcare workers: Protocol for a randomised controlled trial (BRACE trial) Children: Item: Title: Abstract Item: Title: Introduction Item: Title: Study aims Children: Item: Title: Primary objective Item: Title: Secondary objectives Item: Title: Methods and analysis Children: Item: Title: Trial design and setting Item: Title: Participants and eligibility criteria Item: Title: Intervention Item: Title: Randomisation process Item: Title: Blinding Item: Title: Outcome Children: Item: Title: Primary outcomes Item: Title: Secondary outcomes Item: Title: Exploratory outcomes Item: Title: Data and sample collection Children: Item: Title: Questionnaires Item: Title: Illness questionnaires Item: Title: COVID-19 testing Item: Title: Blood sampling Item: Title: Active tracking of missing data Item: Title: Sample size Item: Title: Statistical analysis Item: Title: Interim analysis Item: Title: Ethics and dissemination Children: Item: Title: Ethics Item: Title: Risk Item: Title: Limitations Item: 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