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Contributors AG and GF contributed to study conception, design and drafting of the manuscript. AG, GF, AB and FA contributed to acquisition of data. AG, GF and AB contributed to the analysis and interpretation of data. GF contributed to critical revision of the manuscript.
Competing interests None declared.
Patient consent for publication Obtained.
Provenance and peer review Not commissioned. Externally peer reviewed by Neil Scolding, Bristol, UK.
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