Received: 25 February 2019
Accepted: 21 August 2019
First Online: 27 August 2019
Ethics approval and consent to participate
: All participants provided informed consent to be included in the study and were assured that their personal information would be kept confidential. The parents of the students became aware of the participation of their children in the study. They had the opportunity to prevent their children from participating in the study. The school manager and students’ teachers approved the study. Questionnaires were completed in class. Students who were absent in testing day had the opportunity to participate in the study in following 1 week. All the study procedures were conducted regarding to ethical standards of declaration of Helsinki.
: Not applicable.
: The authors declare that they have no competing interests.