Updates are available Correction dated 2018-08-18

Article History

Received: 2 November 2017

Accepted: 30 April 2018

First Online: 9 May 2018

Change Date: 18 August 2018

Change Type: Correction

Change Details: Following publication of the original article [1], the author requested for an acknowledgement to retrospectively be added to the ‘Acknowledgements’ section of the article [1].

Ethics approval and consent to participate

: The study was reviewed and approved by the local ethics committee of the Medical University of Graz. All participants were personally informed beforehand about the measurement procedure and parental written consent was obtained.

: The authors declare that they have no competing interests.

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