Text and Data Mining valid from 2018-07-18
Received: 1 November 2017
Accepted: 27 June 2018
First Online: 18 July 2018
Ethics approval and consent to participate
: The Institutional Review Board of Technical University of Munich/Germany approved this study. Because of the anonymous nature of the data, the requirement for informed consent was waived.
: Written consent was obtained from the practitioner performing in the Additional file 2: Video “Putting on LLO”.
: The authors declare that they have no competing interests.
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