Received: 13 September 2019
Accepted: 21 November 2019
First Online: 5 December 2019
Ethics approval and consent to participate
: The study was approved by the ethics committee of our institution (Azienda Ospedaliero-Universitaria Ferrara Ethic Committee, protocol number: 74/2016). Informed consent was obtained from each patient or next of kin.
: Not applicable.
: The authors declare that they have no competing interests.