Study selection
The software EndNote X9 was used to import all the references and remove
duplicates. Titles and abstracts of the retrieved articles were
evaluated independently by two reviewers (X.L.L and H.Q.L). Abstracts
that did not provide sufficient information regarding the eligibility
criteria were retained for full-text evaluation. Two reviewers (X.L.L
and H.Q.L) independently evaluated full texts and determined study
eligibility based on the inclusion and exclusion criteria. Any
discrepancies were resolved by the third reviewer (R.H.X).