Anti-Thrombotic Therapy to Ameliorate Complications of COVID-19 (ATTACC): Study design and methodology for an international, adaptive Bayesian randomized controlled trial - Houston, Brett L; Lawler, Patrick R; Goligher, Ewan C; Farkouh, Michael E; Bradbury, Charlotte; Carrier, Marc; Dzavik, Vlad; Fergusson, Dean A; Fowler, Robert A; Nicolau, Jose Carlos (Clinical trials, 2020)