Figures & data
Figure 1. Flow diagram of retrieval and selection of study. CENTRAL, Cochrane Central Register of Controlled Trials; CNKI, China National Knowledge Infrastructure.
![Figure 1. Flow diagram of retrieval and selection of study. CENTRAL, Cochrane Central Register of Controlled Trials; CNKI, China National Knowledge Infrastructure.](/cms/asset/ced30c48-48b5-421d-bb73-2cd65bc1a67a/ihip_a_2209637_f0001_oc.jpg)
Table 1. Characteristics of the included studies (n = 12).
Figure 2. Risk of bias summary. Low risk of bias (green hexagons), unclear risk of bias (white hexagons), and high risk of bias (red hexagons).
![Figure 2. Risk of bias summary. Low risk of bias (green hexagons), unclear risk of bias (white hexagons), and high risk of bias (red hexagons).](/cms/asset/b8b69c93-fd3c-4eb5-996c-12cbe9c9c89d/ihip_a_2209637_f0002_oc.jpg)
Supplemental Material
Download Zip (1.1 MB)Data availability statement
No datasets were generated for this study