A rigorous methodology is used to perform the systematic search for identifying the reviews according to their topic. The literature search comprises several predefined steps such as defining a specific and clear question, identifying all relevant records in at least two electronic databases by using a specific terminology, assessing the study quality and selecting the eligible studies. In order to ensure high quality, the entire process for study selection requires the involvement of at least two reviewers.
The PEROSH Clearinghouse Methods document should be used to perform the systematic search for identifying the reviews according to their topics.