Text and Data Mining valid from 2019-08-13
Received: 18 May 2019
Accepted: 26 July 2019
First Online: 13 August 2019
Compliance with ethical standards
: The authors declare that they have no conflict of interest.
: All the procedures performed in this study were in accordance with the ethical standards of the Institutional Ethical Committee (Ethical Committee of the Area Vasta Emilia Nord—No.: CE547/2018).Informed consent was waived because of the observational retrospective nature of the study.