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. 2021 May 7;12:533033. doi: 10.3389/fpsyg.2021.533033

Figure 1.

Figure 1

Flowchart of the search and screening process (based on the PRISMA statement template). DL, differential learning; TL, traditional learning; CtIt, contextual interference; SL, structural learning (Moher et al., 2015).