Text and Data Mining valid from 2018-09-12
Received: 9 October 2017
Accepted: 31 August 2018
First Online: 12 September 2018
: This study was done with agreement of the Ethic Committee (protocol number: 89556) of the University of Padua (O.P.B.A.).
: Not applicable
: The authors declare that they have no competing interests.
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