Article History
Received: 20 December 2017
Accepted: 16 May 2018
First Online: 1 June 2018
Compliance with ethical standards
:
: The authors declare that they have no conflict of interest.
: Our study complies with the Declaration of Helsinki principles and conforms to ethical requirements. The study protocol was approved by the Ethics Committee of the Department of Medical Sciences, University of Turin.
: All volunteers signed an informed consent form at enrollment.