Received: 9 May 2017
Accepted: 7 December 2017
First Online: 8 February 2018
Ethics approval and consent to participate
: The study conformed to the Declaration of Helsinki and was approved by the institutional ethics committee of Azienda Ospedaliera ArcispedaleS. MariaNuova/IRCCS and Azienda USL di Reggio Emilia, Italy (protocol n°2331, Reggio Emilia, February 18, 2013). Written informed consent was obtained from each participant prior to enrolment in the study. All authors reviewed the manuscript and approved the final version to publish.
: Not applicable.
: The authors declare that they have no competing interests.
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