Thromboprophylactic low-molecular-weight heparin versus standard of care in unvaccinated, at-risk outpatients with COVID-19 (ETHIC): an open-label, multicentre, randomised, control... by Cools, F, Virdone, S, Sawhney, J, Lopes, RD, Jacobson, B, Arcelus, JI, Hobbs, FDR, Gibbs, H, Himmelreich, JCL, MacCallum, P, Schellong, S, Haas, S, Turpie, AGG, Ageno, W, Rocha, AT, Kayani, G, Pieper, K, Kakkar, AK, ETHIC investigators