Footnotes

• Contributors Borghesi: conception, acquisition of data, drafting the article, final approval of the version published. Cipelletti: management of the patient, acquisition and interpretation of data, drafting the article, final approval of the version published. Maragliano: management of the patient, acquisition and interpretation of data, drafting the article, final approval of the version published. Manzoni: analysis of data, critical revision of the manuscript, drafting of the article, final approval of the version published. Stronati: conception, drafting the article, critical revision of the manuscript, final approval of the version published.

• Competing interests None.

• Patient consent Obtained from the parents.

• Provenance and peer review Not commissioned; externally peer reviewed.