2.3. Selection strategy:
After computerized search, titles and received papers abstracts were
screened by the search strategy. Two authors (LG and M.M) selected
articles based on the inclusion criteria independently. Articles
including eligibility criteria in the title and abstract screening were
elected to be checked by full manuscript. Parallel clinical trials were
elected by applying a control group or crossover design in the
systematic review and meta-analysis. All classified trials were
retrieved by either of the authors. According to the data within the
full information, we used a form to elect the studies eligible for
inclusion in the meta-analysis. Contradictions between the authors were
solved by consensus or third researcher.