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Article History

Received: 30 March 2021

Accepted: 4 July 2021

First Online: 27 July 2021

Declarations

:

: We have the agreement of the ethics committee from Medizinische Hochschule Hannover, Germany.

: No personal data is disclosed in our article. The photos used in Fig. InternalRef removed show the main author herself and may be published.

: For our study, we received the training devices for our patients from Flexi-Sports® and the training devices remained in the property of the patients after the study. Apart from that, we received no further grants or support from Flexi-Sports® or another company or institution. Conversely, Flexi-Sports® has not demanded the results of our trial to publish them for advertising. So, we can declare that there is no conflict of interest for us.