Received: 6 February 2019
Accepted: 22 October 2019
First Online: 8 November 2019
Ethics approval and consent to participate
: The ethical committee of Osservatorio Epidemiologico Regionale approved this study. The study follows the principles of the World Medical Association Declaration of Helsinki, and does not involve any experiments on humans or human samples, nor research on identifiable human material and data. Written informed consent to participate in this study was obtained from the participants.
: Not applicable.
: The authors declare that they have no competing interests.