Setting
This meta-trial includes studies of inhaled nebulised UFH in hospitalised patients with COVID-19 who do not immediately require invasive mechanical ventilation. A full list of participating institutions is or will be made available in each individual trial record on respective trial registries. New studies from other institutions and countries may be added to this meta-trial after publication of the meta-trial’s protocol and statistical analysis plan, provided the studies meet the eligibility criteria for the meta-trial (patient eligibility criteria, intervention, core set of outcome measures).