*2.4. Study Selection*

The review was conducted in two steps. In the first step, the titles and abstracts of the articles identified from the databases were screened to remove any duplicates and irrelevant articles. The full texts of the articles selected from the first step were assessed in the second step using the inclusion criteria. Both steps one and two were conducted by two reviewers (B.D and H.V.B) independently. The kappa coefficient was assessed to determine the inter-observer reliability between the two reviewers for steps one and two.
