Funding for this research was provided by:
Landstinget i Kalmar län (n a)
Received: 11 June 2019
Accepted: 26 July 2020
First Online: 1 August 2020
Ethics approval and consent to participate
: The study was approved by the Regional Ethic review Board (EPN) in Linköping, Sweden; reference number 2017/270–31. Since the study was a retrospective observational study where all subjects had been dead for at least 1 year, the Ethics review board did not require any consent to participate. As required by the ethics review board, patient data was de-identified after review of patients’ charts when entering the research data file.
: Not applicable.
: The authors declare that they have no competing interests.