Funding for this research was provided by:
Ministero dell’Istruzione, dell’Università e della Ricerca
Text and Data Mining valid from 2019-07-20
Received: 11 July 2019
Accepted: 17 July 2019
First Online: 20 July 2019
Compliance with ethical standards
: All authors state that they have no conflict of interest.
: All procedures performed in human participants during this retrospective study were in accordance with the ethical standards of institutional and/or national research committee and with the 1964 Helsinki Declaration and its later amendments or comparable ethical standards. The ethical committee approval is not required for retrospective studies.
: For this type of retrospective study, formal consent is not required. Data were anonymized.