Text and Data Mining valid from 2019-09-09
Received: 24 April 2019
Accepted: 6 August 2019
First Online: 9 September 2019
Ethics approval and consent to participate
: The study was approved by the local ethics committee of the University of Naples Federico II and written informed consent was obtained from all the participants.
: Not applicable
: The authors AVR and SB declare a financial interest in the Company “AirNivol S.r.l.” mentioned in the manuscript. The other authors declare that they have no competing interests.