Gifstad, Tone http://orcid.org/0000-0002-4060-9684
Nordskar, Jørgen Jebens
Egeberg, Tarjei
Wik, Tina Strømdal
Winther, Siri Bjørgen
Funding for this research was provided by:
NTNU Norwegian University of Science and Technology
Article History
Received: 10 February 2021
Accepted: 18 May 2021
First Online: 25 May 2021
Declarations
:
: TG, JJN, TWS and SBW declare that they have no competing interests. TE has received grants from Zimmer Biomet outside the submitted work.
: The Regional Committee for Medical and Health Research Ethics, Section A, South East Norway evaluated the project protocol and decided it could be implemented without further approval (IRB00001871 REC South-East A).
: Before being included in the registry, all patients signed written consent forms allowing their data to be used for scientific purposes. No new data were collected.