Received: 22 January 2019
Accepted: 12 September 2019
First Online: 12 October 2019
Ethics approval and consent to participate
: Based on the study design, Institutional Review Board approvals were previously obtained, consent forms had already been signed, and further forms were not required. The privacy rights of participants were observed, and the procedures followed were in accordance with Italian ethical standards and with the Helsinki Declaration of 1975, as revised in 2000.
: Not applicable.
: The authors declare that they have no competing interests.