Table 2.

Progress and timeline (adapted from the PROSPERO International Prospective Register of Systematic Reviews).

Month, Year	Aug-Dec, 2019	Jan-Mar, 2020	Apr-Jun, 2020	Jul-Sep, 2020	Oct-Dec, 2020
Preliminary searches	✓
Piloting of the study selection process	✓
Formal screening of search results against eligibility criteria		✓	✓	✓
Data extraction				✓
Risk of bias assessment					✓
Data analysis					✓