Received: 10 January 2020
Accepted: 21 May 2020
First Online: 10 June 2020
Ethics approval and consent to participate
: This study was approved by the Azienda USL Valle d’Aosta Ethics Committee (protocol no. 23/03/2018.0026243.I) conducted according to the Declaration of Helsinki and written informed consent forms were signed by participants.
: Not applicable.
: The authors declare that they have no competing interests.