Ursodeoxycholic acid and severe COVID-19 outcomes in a cohort study using the OpenSAFELY platform by Ruth E. Costello, Karen M. J. Waller, Rachel Smith, George F. Mells, Angel Y. S. Wong, Anna Schultze, Viyaasan Mahalingasivam, Emily Herrett, Bang Zheng, Liang-Yu Lin, Brian MacKenna, Amir Mehrkar, Sebastian C. J. Bacon, Ben Goldacre, Laurie A. Tomlinson, John Tazare, Christopher T. Rentsch, the OpenSAFELY collaborative, the LH&W NCS (or CONVALESCENCE) Collaborative

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