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Contributors KH and MB contributed to the preparation of the manuscript. MB is the senior and corresponding author who has made all the critical revisions of the intellectual content, approved and edited the final version, and made all the questions and explanations.
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 and public involvement Patients and/or the public were not involved in the design, conduct, reporting or dissemination plans of this research.
Provenance and peer review Commissioned; internally peer reviewed.
Author note References which include a * are considered to be key references.
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