Received: 20 May 2021
Revised: 21 October 2021
Accepted: 15 November 2021
First Online: 27 November 2021
: JM holds stock in LOGEX Healthcare Analytics, a company specialized in analysis of health care data. The other authors declare no conflict of interest.
: All patients in Swespine are given written information about the registry, including information that their data can be used for research and publication if they accept to participate in the register and that they can withdraw their data at any time.
: Retrospective data are used in the current article. All data are anonymized. There are no individual data in the Dialogue support, but all data are on group level. Data are national and cannot be traced to specific location or to an individual, and are not included in the medical record. According to Swedish law, this implies that ethical approval is not needed.