*2.3. Study Selection and Screening Process*

All the records identified over database searching were retrieved and kept in Mendeley® V1.19.4 (Mendeley Ltd., Elsevier, Amsterdam, The Netherlands) and duplicates were removed. Two reviewers independently screened the titles and abstracts. A pilot test was made to verify whether inclusion criteria were met. The two independent reviewers assessed the full text of selected citations in detail against the inclusion criteria. The references of the included studies in the review were hand-searched. Disagreements among the two reviewers were solved through discussion or with a third reviewer. In the case of the inaccessible full article, the author was contacted [15].
