Fig. 1From: Introducing our series: research synthesis and meta-research in biologyTypes of research synthesis and how other types of syntheses are nested within research synthesis (see the main text for more explanation). *Altmetrics is not the type of synthesis, but Altemetrics characterize social influence or impact of a publication by counting appearances in Twitter, Wikipedia, Facebook and also policy documents (https://www.altmetric.com)Back to article page