Article History
Received: 21 December 2017
Accepted: 10 January 2019
First Online: 17 January 2019
Ethics approval and consent to participate
: This study was approved by the local Ethic Committee at the University of Naples Federico II. All of the participants signed specific informed consent form before the acquisitions.
: All of the participants gave written informed consent for publication.
: The authors declare that they have no competing interests.
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