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Fig 1.

PRISMA flowchart.

This figure shows the number of studies retrieved at each stage of the search strategy.

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Table 1.

Characteristics of included studies.

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Table 1 Expand

Table 2.

Theme-wise segregation of findings in included studies.

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Table 2 Expand

Table 3.

Limitations for VMDTMs reported across included studies.

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Table 3 Expand