Study	Reason for exclusion
Al‐Samkari 2020	Irrelevant study design. Retrospective cohort study without a parallel comparator group of intervention
Artifoni 2020	Irrelevant study design. Retrospective cohort study without a comparator group (single‐arm study)
EudraCT2020‐001823‐15	Irrelevant study design. Prospective cohort study without a comparator group (single‐arm study).
Helms 2020	Irrelevant study design. Prospective cohort study without an intervention purpose
Khider 2020	Irrelevant study design. Prospective cohort study without a parallel comparator group of intervention
NCT04354155	Irrelevant study design. Prospective cohort study without a comparator group (single‐arm study)
NCT04359212	Irrelevant study design. Prospective cohort study without a parallel comparator group of intervention
NCT04365309	Irrelevant intervention. RCT of aspirin for COVID‐19. There is no difference between the intervention groups regarding anticoagulants.
NCT04368377	Irrelevant study design. Prospective cohort study without a comparator group (single‐arm study).
NCT04394000	Irrelevant study design. Prospective before‐after cohort study without a parallel comparator group
NCT04427098	Irrelevant study design. Prospective cohort study without a comparator group (single‐arm study)
Zhang 2020	Irrelevant study design. Retrospective cases series. Description of 7 participants without a consistent comparator group

RCT: randomised controlled trial