2 METHODS
The review involved two stages: the first stage involved search in
database, while the second stage included checking all the related
studies found from the first stage to guarantee precision and constancy
of the study. The guideline of “The Preferred Reporting Items for
Systematic Review and Meta‐Analysis protocols (PRISMA)” was
applied5 (See Supplementary File .1). This systematic
review was registered in the PROSPERO under the number (CRD42021223297).