Article History
First Online: 15 August 2019
Compliance with Ethical Standards
:
: The authors declare that they have no conflict of interest.
: The study follows the ethical principles and guidelines for the protection of the human subjects of research. The University of Parma (Italy) guarantees the respect of the principles of research ethics by researchers who work there.
: Each participant, or both parents in the case of individuals under 18 years, have given voluntary informed consent.