Mack et al. 2015

Gleason et al. 2018

Sondergaard et al. 2019

Makkar et al. 2020

Random sequence generation (Selection bias)

Allocation concealment (Selection bias)

Blinding of participants and personnel (Performance bias)*

Blinding of outcome assessment (Detection bias)

Incomplete outcome data

(Attrition bias)

Selective reporting (Reporting bias)

Other sources of bias