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Contributors design: YL, SB, RP. Data Collection: YL, SB. Data Analysis: YL and SB. Study support and intellectual input: RP and AC. Drafting of the maunscript: YL. Revision of the manuscript: RP, AC and PF. Approval of the final version of the manuscript: all authors.
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 Not required.
Provenance and peer review Not commissioned; internally peer reviewed.
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