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Fig 1.

Search Strategy.

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Fig 2.

Flowchart of literature search.

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Fig 3.

Gough’s Weight of Evidence Framework.

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Fig 4.

PPOD by patient condition (A) and PPOD by patient condition including missing data (B).

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Fig 5.

PPOD by participant role (A) and PPOD by participant role including missing data (B).

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Fig 6.

PPOD by where participants were asked (A) and including missing data (B).

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