Received: 16 February 2020
Accepted: 17 June 2020
First Online: 29 June 2020
Ethics approval and consent to participate
: The study was approved by the ethics committee of Oulu University Hospital and Northern Ostrobothnia Hospital District (224/2013). The use of brain tissue samples obtained at autopsy was approved by the National Institute for Health and Welfare (BB_2017_1003).
: Not applicable.
: The authors declare that they have no competing interests.