Text and Data Mining valid from 2019-02-04
Received: 11 April 2018
Accepted: 25 January 2019
First Online: 4 February 2019
Ethics approval and consent to participate
: This study was approved by the Ethics Committee at the University “G. d’Annunzio” Chieti-Pescara (Ethics Committee Project No.3 the 06/02/2012 and informed consent was waived due to the observational nature of the study.
: Not applicable.
: The authors declare that they have no competing interests.
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