Ellwein, Alexander
Lill, Helmut
Smith, Tomas
Voigt, Christine
Imrecke, Julia
Katthagen, Jan Christoph
Article History
Received: 7 January 2019
Revised: 27 February 2019
Accepted: 10 May 2019
First Online: 6 June 2019
Compliance with ethical guidelines
:
: H. Lill and T. Smith are consultants for DepuySynthes. A. Ellwein, C. Voigt, J. Imrecke and J.C. Katthagen declare that they have no competing interests.
: The study protocol was approved by the local ethics committee of Medizinische Hochschule Hannover (Nr. 1667-2012) and complied with the principles of the Declaration of Helsinki.