OpenSAFELY: impact of national guidance on switching anticoagulant therapy during COVID-19 pandemic by Ben Goldacre, David Evans, Sam Harper, Alex J Walker, Richard Croker, Liam Smeeth, Rohini Mathur, Krishnan Bhaskaran, Henry Drysdale, Ian Douglas, Harriet Forbes, Elizabeth Williamson, Brian MacKenna, William Hulme, Anna Schultze, Christopher T Rentsch, Seb Bacon, Chris Bates, Helen J Curtis, Amir Mehrkar, Peter Inglesby, Jonathan Cockburn, Laurie Tomlinson, Rosalind M Eggo, John Parry, Frank Hester, Simon Davy, Angel Yun Wong, Caroline Morton, George Hickman, Tom Ward

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