Received: 13 December 2019
Accepted: 2 June 2020
First Online: 26 June 2020
Ethics approval and consent to participate
: The study was carried out following approval by the Ethics Committee of the Department of Internal Medicine and Medical Therapy at the University of Pavia (Italy). Subjects provided their written consent to participate in the study.
: Not applicable.
: The authors declare that they have no competing interests.