Jansen, Martin https://orcid.org/0000-0002-3737-8344
Puetz, Gerhard
Hoffmann, Michael M.
Winkler, Karl
Article History
Received: 17 May 2018
Accepted: 4 January 2019
First Online: 22 January 2019
Ethics approval and consent to participate
: Data were taken from two not yet terminated studies and from volunteers and were approved by the Freiburg Ethics Committee. Written consent was given by each participant.
: Not applicable.
: The authors declare that they have no competing interests.
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