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Contributors AS planned the study, collected data, searched the literature and submitted the manuscript. AK designed and critically supervised the manuscript. AA collected data and searched the literature. All authors wrote the manuscript together.
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 Consent obtained directly from patient(s).
Provenance and peer review Not commissioned; internally peer reviewed.