Received: 9 January 2019
Accepted: 14 June 2019
First Online: 24 June 2019
Ethics Approval and Consent to Participate
: Informed consent to participate in the study was obtained from all participants.
: Not applicable
: The authors, Guglielmo Niccolò Piozzi, Riccardo Cirelli, Ilaria Salati, Marco Enrico Mario Maino, Ennio Leopaldi, Giovanni Lenna, Franco Combi, and Giuseppe Massimiliano Sansonetti, declare that they have no competing interests.