Senior Registrar, Medical Directorate, Unit of Clinical Epidemiology, Lecturer in Epidemiology, Faculty of Nursing Sciences, University of Tor Vergata, Bambino Gesú Children's Hospital - IRCCS, Rome, Italy.
Vincenzo M. Di Ciommo – Substantial contributions to conception and design, Acquisition of data, Analysis and interpretation of data, Drafting the article, Revising it critically for important intellectual content, Final approval of the version to be published
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Authors declare no conflict of interest.