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.