Selection strategy
After a primary search, all recorded articles found from electronic or manual searches were entered into endnote software for screening (EndNote X6, Thomson Reuters, New York). Titles and received abstracts of papers were screened by the search strategy. studies were evaluated independently by two reviewers and selected according to the inclusion criteria independently. Articles including eligibility criteria in the title/abstract screening were selected to be checked by full-text. All clinical trials were included in the present met analysis if our inclusion criteria met. All categorized trials were retrieved by either of the authors. On the basis of the information within the full information, we used a standardized form to select the trials eligible for inclusion in the review. Contradictions between the authors were solved by consensus or third researcher.