Received: 4 June 2019
Accepted: 28 December 2019
First Online: 14 January 2020
Ethics approval and consent to participate
: All study participants provided informed consent and the study protocol was approved by the Ethics Committee for Biomedical Research of Ferrara. This observational study was performed consistently with the approved guidelines.
: All authors consent to the submission of the manuscript as it is.
: The authors declare that they have no competing interests.