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Article History

First Online: 19 February 2018

Compliance with ethical standards

:

: This study received funding from the “Cassa di Risparmio di Pistoia e Pescia Foundation”, a private nonprofit institution.

: All authors declare that they have no conflict of interest.

: All procedures performed in this study involving human participants were in accordance with the ethical standards of the institutional research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards. Informed consent was obtained from all individual participants included in the study. This article does not contain any studies with animals performed by any of the authors.