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Article History

Received: 19 January 2017

Accepted: 14 May 2018

First Online: 29 May 2018

Ethics approval and consent to participate

: It was not possible to apply for the victims’ consent nor for ethical committee approval, because this was a study based on anonymized data (which are impossible to correlate to any individual), managed with statistical purposes, following the provisions of Italian legislation; in particular see Authorisation no. 9/2016 of The Italian Data Protection Authority - General Authorisation to Process Personal Data for Scientific Research Purposes, article 2.2, published in Italy’s Official Journal No. 303 of 29 December 2016 and Authorisation no. 8/2016 of The Italian Data Protection Authority - General Authorisation to Process Genetic Data, article 3.1 sub c and article 8.1 sub a, published in Italy’s Official Journal No. 303 of 29 December 2016.

: The authors declare that they have no competing interests.

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