Received: 21 September 2019
Accepted: 5 January 2020
First Online: 10 January 2020
Ethics approval and consent to participate
: Written consent was obtained from all patients. The study protocol was approved by the Ethics Committee of the Department of Internal Medicine of Genoa University. Data collection and subsequent analysis were performed in compliance with the Helsinki Declaration.
: Not applicable.
: The authors declare that they have no competing interests.