Two reviewers separately entered the data into Review Manager Software 5.3.



Review Manager Software
The following Chinese and English databases were searched for relevant articles: Pubmed, Embase, Cochrane library, Web of Science, CNKI (China National Knowledge Infrastructure) and Wanfang. 
Pubmed
The following Chinese and English databases were searched for relevant articles: Pubmed, Embase, Cochrane library, Web of Science, CNKI (China National Knowledge Infrastructure) and Wanfang. 
Embase
The following Chinese and English databases were searched for relevant articles: Pubmed, Embase, Cochrane library, Web of Science, CNKI (China National Knowledge Infrastructure) and Wanfang. 
Cochrane library
The following Chinese and English databases were searched for relevant articles: Pubmed, Embase, Cochrane library, Web of Science, CNKI (China National Knowledge Infrastructure) and Wanfang. 
Web of Science
The following Chinese and English databases were searched for relevant articles: Pubmed, Embase, Cochrane library, Web of Science, CNKI (China National Knowledge Infrastructure) and Wanfang. 
CNKI (China National Knowledge Infrastructure)
The following Chinese and English databases were searched for relevant articles: Pubmed, Embase, Cochrane library, Web of Science, CNKI (China National Knowledge Infrastructure) and Wanfang. 
Wanfang