Funding for this research was provided by:
Helsingin ja Uudenmaan Sairaanhoitopiiri (9310/403)
Suomen Lääketieteen Säätiö
Text and Data Mining valid from 2019-06-01
Received: 31 December 2018
Accepted: 24 May 2019
First Online: 1 June 2019
Compliance with ethical standards
: The authors declare that they have no conflicts of interest.
: The creation of the PERFECT Spine database was approved by the Ethics Committee of the National Institute for Health and Welfare (THL 496/6.02.00/2011). As the data was acquired from the administrative registries anonymized, and the patients were not contacted, informed consent is not required.