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Fig 1.

PRISMA 2020 flow diagram.

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Table 1.

Overview of characteristics of included studies.

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Table 2.

Online platforms and specific social media platforms used for recruitment to trials.

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Table 2 Expand

Table 3.

Compensation type and amounts reported.

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Table 3 Expand

Fig 2.

Risk of bias (RoB) assessment summary for all included trials.

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Fig 2 Expand