Funding for this research was provided by:
Received: 16 May 2021
Accepted: 12 November 2021
First Online: 7 January 2022
: The study was conducted in accordance with the Declaration of Helsinki, and data management was handled according to Swedish law and regulations. The study was approved by The Swedish Ethical Review Authority (2020–03863). Informed consent was obtained from the patients (or caregivers) on the day of surgery. Written informed consent is not required by Swedish law for the collection of data from Swedish quality registers.
: Not applicable.
: The study was performed by members of the steering committee of the NTSRS. All monitors were at all times, when handling data from the medical records, blinded to data in the NTSRS. The statistical analyses were performed by external professional statisticians.