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Handling editor Iskander Chaudhry.
Contributors MS contributed to concept, collection of data and drafting manuscript. PS contributed to concept, intellectual content and editing of manuscript. SD contributed to collection of clinical data. SS contributed to collection of clinical data. AS contributed to collection of clinical data.
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.
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