2.4 Study selection
NoteExpress software was used for research screening. First, two
researchers (J Jiang and ZG Wu) independently screened and checked the
titles and abstracts of articles to exclude duplicate and irrelevant
studies. Second, the full text of potentially eligible studies was
downloaded and reviewed according to the inclusion and exclusion
criteria stated above. Finally, when inconsistencies or disagreements
arose, a third author (W Zhang) assisted in resolving the issue.