Text and Data Mining valid from 2019-04-12
Received: 20 November 2017
Revised: 2 May 2018
Accepted: 25 May 2018
First Online: 12 April 2019
Compliance with ethical guidelines
: H. Quitmann is a consultant for MicroPort Orthopedics for surgical observation services.
: 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.