Received: 11 January 2021
Accepted: 8 March 2021
First Online: 7 July 2021
: This study was approved by the Regional Committee for Medical and Health Research Ethics North (REC North); reference number 2017/2419. Patients still alive when the study was undertaken were included on the basis of active informed consent. No minors were eligible for inclusion and all consents were personal. All deceased patients were included since the need for consent from next of kin or legal guardian was waived by REC North. The Data Access Committee of Nord-Trøndelag Hospital Trust and the Data Protection Officer of Helse Møre og Romsdal Trust approved the project. All data were managed in accordance with the General Data Protection Regulation (GDPR), adapted by the European Union (EU) in 2016.All methods were carried out in accordance with relevant guidelines and regulations.
: Not applicable.
: All authors declare no competing interests.