Received: 6 July 2020
Accepted: 14 September 2020
First Online: 12 October 2020
Ethics approval and consent to participate
: The study was conducted in accordance with the Helsinki Declaration of 1975 and its 2000 revision. Obtaining medical records was approved by the hospital districts of Pirkanmaa, Southwest Finland, Northern Ostrobothnia and Uusimaa, by the university hospitals of Tampere, Oulu, Turku and Helsinki, and by the central hospitals of Seinäjoki and Satakunta. According our national guidelines, no further ethical approval or informed consent was needed for this retrospective registry-based study [CitationRef removed].
: Not applicable.
: The authors declare no conflict of interest.