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Contributors RT contributed to the conception and design, as well as writing of the manuscript. MF, DP, VL and FN contributed to the data acquisition, writing of the manuscript and its revision for important intellectual content.
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 Obtained.
Provenance and peer review Not commissioned; externally peer reviewed.
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