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. 2020 Apr 1;10(4):e034286. doi: 10.1136/bmjopen-2019-034286

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© Author(s) (or their employer(s)) 2020. Re-use permitted under CC BY-NC. No commercial re-use. See rights and permissions. Published by BMJ.

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Flow diagram of search strategy (search 1 and search 2) and selection process. PBOM, performance-based outcome measure; PROM, patient-reported outcome measure.