LAUSR

16 Elze MC, Gregson J, Baber U, et al. Comparison of propensity score methods and covariate adjustment: evaluation in 4 cardiovascular studies. J Am Coll Cardiol 2017;69:345–57. 17 Cases in the UK | coronavirus in the UK. Available: https://coronavirus.data.gov.uk/ details/cases [Accessed 30 Jun 2021]. 18 Dofferhoff ASM, Piscaer I, Schurgers LJ. Reduced vitamin K status as a potentially modifiable risk factor of severe coronavirus disease 2019. Clin Infect Dis 2020. 19 NICE. Atrial fibrillation: management | guidance | NICE, 2014. Available: https://www. nice.org.uk/guidance/cg180 [Accessed 22 Jun 2021]. 20 NHS Digital. QOF 201920 | NHS digital. Available: https://qof.digital.nhs.uk/ [Accessed 30 Jun 2021]. 21 Curtis HJ, MacKenna B, Walker AJ. OpenSAFELY: impact of national guidance on switching from warfarin to direct oral anticoagulants (DOACs) in early phase of COVID19 pandemic in England. medRxiv 2020:2020.12.03.20243535. 22 NHS England. Specialty guides for patient management during the coronavirus pandemic Clinical guide for the management of anticoagulant services during the coronavirus pandemic, 2020. Available: https://www.england.nhs.uk/coronavirus/ publication/specialty-guides/%0Ahttps://www.england.nhs.uk/coronavirus/wpcontent/uploads/sites/52/2020/03/C0077-Specialty-guide_Anticoagulant-servicesand-coronavirus-v1-31-March.pdf [Accessed 30 Jun 2021]. 23 Dalgaard F, Mulder H, Wojdyla DM, et al. Patients with atrial fibrillation taking nonsteroidal antiinflammatory drugs and oral anticoagulants in the ARISTOTLE trial. Circulation 2020;141:10–20. 24 Søgaard KK, HorváthPuhó E, Grønbaek H, et al. Risk of venous thromboembolism in patients with liver disease: a nationwide populationbased casecontrol study. Am J Gastroenterol 2009;104:96–101. 25 Qamar A, Vaduganathan M, Greenberger NJ, et al. Oral anticoagulation in patients with liver disease. J Am Coll Cardiol 2018;71:2162–75. 26 Lee SR, Lee HJ, Choi EK, et al. Direct oral anticoagulants in patients with atrial fibrillation and liver disease. J Am Coll Cardiol 2019;73:3295–308. 27 Donzé J, Clair C, Hug B, et al. Risk of falls and major bleeds in patients on oral anticoagulation therapy. Am J Med 2012;125:773–8. 28 Williamson EJ, Walker AJ, Bhaskaran K, et al. Factors associated with COVID19related death using OpenSAFELY. Nature 2020;584:430–6. 29 Marmot M, Bell R. Fair society, healthy lives. Public Health 2012;126 Suppl 1:S4. 30 Fauvel C, Weizman O, Trimaille A, et al. Pulmonary embolism in COVID19 patients: a French multicentre cohort study. Eur Heart J 2020;41:3058–68.