Pitzen, Tobias
Jeszenszky, Dezsö
Stoltze, Klaus Dieter
Ostrowski, Gregor
Ruf, Michael
Article History
First Online: 30 October 2019
Compliance with ethical guidelines
:
: T. Pitzen: Fees for lectures and hospitant care by BBraun Aesculap, DePuy Synthes, Medtronic, Nuvasive, and Heel Pharma. D. Jeszensky: Fees for lectures and consultation by DePuy Synthes, Medacta. M. Ruf: Lecture fees by DePuy Synthes, Medtronic, Nuvasive. K.D. Stoltze and G. Ostrowski declare that they have no competing interests.
: For this article no studies with human participants or animals were performed by any of the authors. All studies performed were in accordance with the ethical standards indicated in each case.