Funding for this research was provided by:
Received: 15 September 2017
Accepted: 15 March 2018
First Online: 18 April 2018
Ethics approval and consent to participate
: This study was approved by our institutional ethics committee (Comitato Etico Università Cattolica del Sacro Cuore 1883/12), and study participants gave written informed consent.
: Not applicable.
: The authors declare that they have no competing interests.
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