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Table 1.

Ovid medline database search strategy: Epub ahead of print, in-process & other non-indexed citations, ovid MEDLINE® daily and ovid MEDLINE® <1946-present>.

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Fig 1.

PRISMA flow diagram reporting search results.

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Table 2.

Data extraction and summary of results (n = 66).

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Table 3.

Geographical representation of included studies (n = 66).

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Table 4.

Research design, methodology, sample source, pre-existing disorders/symptoms, and measured outcomes of included studies (n = 66).

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