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Contributors AC and SBCG conceived the idea, conducted the literature searches and drafted the manuscript. Both authors have satisfied the International Committee of Medical Journal Editors (ICMJE) criteria for authorship and have reviewed and approved the final version prior to submission. AC is the guarantor.
Funding This research received no specific grant 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.