Funding for this research was provided by:
Bundesministerium der Verteidigung
Foundation of German Business
Text and Data Mining valid from 2020-05-06
Received: 8 August 2019
Accepted: 12 April 2020
First Online: 6 May 2020
Ethics approval and consent to participate
: The study was approved by the Ethics committee of Freie Universität Berlin (85/2014), after internal approval from the German Armed Forces. All participants gave informed written consent.
: Not applicable.
: HR and GDW are employed by the German Armed Forces. Their employment had no influence on the study design or the collection, analysis and interpretation of data. All other authors declare that they have no conflict of interest.