Effect of convalescent plasma on organ support-free days in critically ill patients With COVID-19: a randomized clinical trial حسب Estcourt, LJ, Turgeon, AF, McQuilten, ZK, McVerry, BJ, Al-Beidh, F, Annane, D, Arabi, YM, Arnold, DM, Beane, A, Bégin, P, van Bentum-Puijk, W, Berry, LR, Bhimani, Z, Birchall, JE, Bonten, MJM, Bradbury, CA, Brunkhorst, FM, Buxton, M, Callum, JL, Chassé, M, Cheng, AC, Cove, ME, Daly, J, Derde, L, Detry, MA, De Jong, M, Evans, A, Fergusson, DA, Fish, M, Fitzgerald, M, Foley, C, Goossens, H, Gordon, AC, Gosbell, IB, Green, C, Haniffa, R, Harvala, H, Higgins, AM, Hills, TE, Hoad, VC, Horvat, C, Huang, DT, Hudson, CL, Ichihara, N, Laing, E, Lamikanra, AA, Lamontagne, F, Roberts, DJ