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First Online: 19 March 2018

Compliance with ethical standards

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: The researchers developed an extensive privacy plan which also includes consent forms for human subjects. All consent forms were signed by the teachers, students as well as their parents prior to data collection. All guidelines for research with human subjects were followed. No identity-revealing information has been used for students and the data are kept confidential for the purpose of this study with no access to public.

: The researchers had no conflicts of interest in this study.