2.4. Selection of sources of evidence and data collection process

Rayyan QCRI¹⁵ will be used and all references found will be inserted into this software, in addition, duplicate studies will be excluded. After that, two independent reviewers will analyze the titles and abstracts of the studies found. If there are disagreements, a third reviewer will be consulted to resolve them. Then, the reviewers will evaluate the eligibility of the studies according to the reading of the full text (Fig. 1).

Flowchart of study selection and inclusion process.

A Microsoft Office Excel® spreadsheet will be used for data extraction. The following variables will be extracted:

Some changes can be made in the data extraction process according to the needs identified during the study.