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Article History

Received: 6 November 2018

Accepted: 10 April 2019

First Online: 24 April 2019

Ethics approval and consent to participate

: Data were treated with full confidentiality in accordance with Italian legislation. Before the database was made available to the authors, patient identifiers were replaced with anonymous codes that make it impossible to identify the individuals concerned. It was unnecessary to obtain patients’ informed consent, given the anonymous nature of the data and its mandatory recording (anonymized data may be analyzed and used in aggregate form for scientific studies without further authorization) [CitationRef removed]. This study complies with the Declaration of Helsinki.

: Not applicable.

: The authors declare that they have no competing interests.

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