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Contributors SL: data collection, figures, writing (original draft); TD and MD: data collection, writing (review and editing); CA: data collection, literature search, writing (review and editing); JB: data collection, data analysis, writing (review and editing); JAKH: literature search, data analysis, data interpretation, writing (review and editing); JKR: data analysis, data interpretation, writing (review and editing); MK-K: literature search, figures, data analysis, data interpretation, writing (review and editing).
Funding The authors have not declared a specific grant for this research from any funding agency in the public, commercial or not-for-profit sectors.
Competing interests None declared.
Provenance and peer review Not commissioned; externally peer reviewed.