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Fig 1.

Preferred Reporting of Items for Systematic Reviews and Meta-Analyses (PRISMA) flow chart.

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Fig 2.

Frequency of primary and secondary outcomes reported by studies.

(a) e.g. intervention uptake, retention, engagement, adherence, cost.

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Fig 2 Expand

Table 1.

Digital intervention delivery methods.

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Table 1 Expand

Fig 3.

Frequency of topics specified in studies.

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Fig 3 Expand