Text and Data Mining valid from 2020-01-29
Received: 3 December 2019
Accepted: 14 January 2020
First Online: 29 January 2020
Ethics approval and consent to participate
: The study was approved by the ethics committee of the university Leipzig (medical faculty: 355/15-ff).
: Not applicable.
: C.-E. Heyde: Consultant for Medacta (Switzerland).The authors declare that they have no further competing interests.