The retrieved records will be imported into the EndNote X9 software and the duplicate publications were excluded. Two reviewers independently read the titles and abstracts of all identified records to exclude those that are clearly not relevant. Then the full texts of the articles retained are reviewed to further determine their eligibility. Differences opinions were resolved by consensus.
The data are extracted by 2 reviewers independently using a pre-defined form. The following characteristics of included studies are collected: the first author, publication year, country, number of included patients, age, the detail of the intervention, treatment duration, follow-up time, and adverse events. Any discrepancies are resolved by consensus.
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