Figures & data
Figure 1. Flowchart of search and screening process according to the PRISMA guidelines (Moher, Liberati, Tetzlaff, Altman, & the PRISMA Group, 2009)
![Figure 1. Flowchart of search and screening process according to the PRISMA guidelines (Moher, Liberati, Tetzlaff, Altman, & the PRISMA Group, 2009)](/cms/asset/8b1ec8f2-1cfc-4147-af4b-76c590503bac/ctat_a_2062710_f0001_b.gif)
Table 1. The coding of the articles
Figure 3. Framework of general pedagogical knowledge, pedagogical content knowledge and content knowledge
![Figure 3. Framework of general pedagogical knowledge, pedagogical content knowledge and content knowledge](/cms/asset/956176f3-2bf0-4f7a-8c67-5c7ac153a844/ctat_a_2062710_f0003_oc.jpg)