Text and Data Mining valid from 2019-05-21
Received: 5 July 2018
Accepted: 15 April 2019
First Online: 21 May 2019
Ethics approval and consent to participate
: This study is registered at the Dutch Data Protection Authority and meets national ethics and privacy requirements. Before data collection, information letters were sent to parents and students. A passive informed consent procedure was used, so students and their parents could decide to not to complete the questionnaire. This method of passive agreement is in accordance with Dutch legal standards. Medical ethical approval was sought from the Medical Ethical Review Committee of the Amsterdam Academic Medical Centre (AMC) before analysis; however, our request was not considered as observational studies on anonymised data are not subject for ethical approval.
: Not applicable.
: The authors declare they have no competing interests.
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