Received: 21 January 2020
Accepted: 31 March 2020
First Online: 7 April 2020
Change Date: 21 October 2020
Change Type: Correction
Change Details: An amendment to this paper has been published and can be accessed via the original article.
Ethics approval and consent to participate
: Informed written consent was obtained from all participants and their parents, whereas the participation was entirely voluntary and confidentiality assured. The study was also performed following the Declaration of Helsinki and approved by the Human Ethics Committee of X University of Medical Sciences.
: Not applicable.
: The authors declare that they have no competing interests.