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. 2021 Jun 24;27(6):518–528. doi: 10.1016/j.pulmoe.2021.06.005

Table 1.

Methodological quality assessment of the 33 studies included.

Image, table 1

Colours show the risk of bias for each single item; green: absence of bias, red: presence of bias; yellow: at least one reviewer stated that the item could not be determined.