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Contributors AB contributed to conception and design; acquisition of data; analysis and interpretation of data; preparation of manuscript; review of literature; final draft preparation; approval. GB contributed to conception and design; analysis and interpretation of data; preparation of manuscript; review of literature; approval. NS contributed to conception and design; acquisition of data; analysis and interpretation of data; preparation of manuscript; review of literature; final draft preparation; approval. CB contributed to conception and design; acquisition of data; approval. KS contributed to conception and design; acquisition of data; preparation of manuscript; review of literature; AS contributed to conception and design; acquisition of data; analysis and interpretation of data; preparation of manuscript; review of literature; final draft preparation; approval.
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.
Patient consent for publication Not required.
Provenance and peer review Not commissioned; externally peer reviewed.