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Article History

Received: 9 August 2018

Accepted: 14 May 2019

First Online: 24 May 2019

Ethics approval and consent to participate

: Ethical approval was applied for and granted by the local ethics committee of the Medical University of Vienna (EK-Nr: 1210/2016). By filling in the questionnaire, patients and their parents gave written consent to participate in this study.

: Not applicable.

: The authors declare that they have no competing interests.

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