Article History
First Online: 12 August 2018
Compliance with Ethical Standards
:
: The authors declare that they have no conflict of interest.
: Human participants were involved. The study was conducted in compliance with the Code of Ethics of the World Medical Association (Declaration of Helsinki). Ethical approval was obtained from the Ethical Committee of the University of Padua.
: Singed consent was obtained from parents and participants provided their oral assent before participation.