Declaration of interest
The authors have no relevant affiliations or financial involvement with any organization or entity with a financial interest in or financial conflict with the subject matter or materials discussed in the manuscript. This includes employment, consultancies, honoraria, stock ownership or options, expert testimony, grants or patents received or pending, or royalties.
Reviewer disclosures
Peer reviewers on this manuscript have no relevant financial or other relationships to disclose.
Author contributions
All authors contributed to the study conception and design. Material preparation, data collection and analysis were performed by E Camela, L Potestio and M Megna. The first draft of the manuscript was written by E Camela, L Potestio and M Megna, and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript. All authors contributed equally to the manuscript and read and approved the final version of the manuscript.