Article History
Received: 16 August 2019
Revised: 8 December 2019
Accepted: 19 December 2019
First Online: 9 January 2020
Compliance with ethical standards
:
: The authors declare that they have no conflict of interest.
: The Ethics Committee of our University, School of Medicine approved the study protocol (<i>03-106-15</i>). Written informed consent was obtained from all participants and their parents.