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. 2022 Jan 28;10:e12829. doi: 10.7717/peerj.12829

Figure 1. The PRISMA flow diagram.

Figure 1

For the purposes of this review we focused on medical literature studies with actual participants. A total of 228 articles are included. We have identified seven parameters, that based on our experience as well as the current literature could significantly differentiate the outcome of a PD experiment. Each article was examined and classified based on the choice that the experimenters have made concerning these seven PD parameters.