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Contributors MMC conceived the study and participated in the drafting of the manuscript. SBR, GL and CB participated in the drafting of the manuscript. SG coordinated the study and participated in the drafting of the manuscript.
Funding This work was funded by a grant provided by the Regione Toscana, Italy (Regional Health Research Programme).
Competing interests None.
Provenance and peer review Not commissioned; externally peer reviewed.
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