Funding for this research was provided by:
Università degli Studi della Campania Luigi Vanvitelli (Programma VALERE (VAnviteLli pEr la RicErca))
Received: 5 November 2019
Accepted: 9 January 2020
First Online: 20 January 2020
Ethics approval and consent to participate
: The study was approved by the local Ethical Committee (Napoli Federico II; #161/15) and all subjects gave their written informed consent before study participation.
: Not applicable.
: The authors declare that they have no competing interests.