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Authors
Napolitano, Andrea
Vincenzi, Bruno
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Article History
Received: 28 November 2018
Revised: 15 January 2019
Accepted: 15 January 2019
First Online: 22 February 2019
Competing interests
: The authors declare no competing interests.
: Data and materials are available from the authors upon request.
: This work is published under the standard license to publish agreement. After 12 months the work will become freely available and the license terms will switch to a Creative Commons Attribution 4.0 International (CC BY 4.0).
Free to read: This content has been made available to all.
