Updates are available Correction dated 2019-02-20

Article History

Received: 8 May 2018

Accepted: 14 December 2018

First Online: 27 December 2018

Change Date: 20 February 2019

Change Type: Correction

Change Details: Following publication of the original article [1], the author reported that the given name and family name of all authors were swapped.

Competing interest

: None. The authors have revealed all financial and personal relationships to other people or organizations that could inappropriately influence (bias) this work.

: Approval was received from the ethics commission of the University of Heidelberg (S-174/2016). Informed consent to participate as well as written consent for anonymous data collection and anonymous recording of videos during the training sessions was obtained from each participant.

: Prior to study participation written informed consent for publication of the acquired anonymous data was obtained from each participant.

: The authors declare that they have no competing interests.

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