Received: 27 February 2018
Accepted: 26 April 2018
First Online: 9 May 2018
Ethics approval and consent to participate
: Due to the nature of the study based on a CT scan that was performed for another reason than the finite element analysis (FEA) without need for any further individual data, the “Independent Ethics Committee of the Faculty of Medicine” at the University Regensburg Medical Centre confirmed that an ethics opinion in accordance with the 1964 Helsinki Declaration is not necessary (institutional review board number 18-180-0000).
: The authors declare that they have no competing interests.
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