Article History
Received: 9 July 2018
Accepted: 15 October 2018
First Online: 8 November 2018
Ethics approval and consent to participate
: This study was conducted according to the guidelines of the Declaration of Helsinki and was exempt from full ethics review by the Ethics Committee of Canton Ticino, in accordance with Swiss Human Subjects Law. Written informed consent was obtained from all the parents and children prior to data collection.
: Not applicable.
: The authors declare that they have no competing interests.
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