Potentially inappropriate prescribing of DOACs to people with mechanical heart valves: A federated analysis of 57.9 million patients' primary care records in situ using OpenSAFELY by Fisher, L, Speed, V, Curtis, HJ, Rentsch, CT, Wong, AYS, Schultze, A, Massey, J, Inglesby, P, Morton, CE, Wood, M, Walker, AJ, Morley, J, Mehrkar, A, Bacon, S, Hickman, G, Bates, C, Croker, R, Evans, D, Ward, T, Cockburn, J, Davy, S, Bhaskaran, K, Smith, B, Williamson, E, Hulme, W, Green, A, Eggo, RM, Forbes, H, Tazare, J, Parry, J, Hester, F, Harper, S, Meadows, J, O'Hanlon, S, Eavis, A, Jarvis, R, Avramov, D, Griffiths, P, Fowles, A, Parkes, N, Douglas, IJ, Evans, SJW, Smeeth, L, MacKenna, B, Tomlinson, L, Goldacre, B