Figure 2.

Risk of bias plots. Traffic lights plots for in vitro studies: Dirk Mohn, 2011 [17], Philipp Sahrmann, 2014 [21], Jerome F. Lasserre, 2016 [18], Ashwaq Ali Al-Hashedi, 2016 [13], Schneider, 2018 [30], Christoph Ratka, 2019 [28] and Maximilian Koch, 2020 [29].