Received: 3 October 2019
Accepted: 21 February 2020
First Online: 2 March 2020
Ethics approval and consent to participate
: The present study is in agreement with the publication guidelines of the TraumaRegister DGU® of the German Trauma Society and received the registration ID 2018–014 upon approval by the institutional review board.
: Not applicable.
: The authors declare that they have no competing interests.