Table 2.

Risk-of-bias assessment.

	Walter et al. 2003 [5]	Walter, 2013 [14]	Borthakur et al. 2014 [15]	Gamis et al. 2014 [16]	Amadori et al. 2016 [17]	Olombel et al. 2016 [18]	Hosono et al. 2021 [19]	Döhner et al. 2023 [20]
Address a clearly focused issue
Acceptable cohort recruitment
Exposure accurately measured
Outcome accurately measured
Important confounding factors identified
Important confounding factors accounted for
Precise results
Believable results
Results fit with other available data.
Overall quality score

Data based on CASP-based risk-of-bias assessment. Green is a good risk of bias; orange is a moderate risk of bias; red is a low risk of bias.