Funding for this research was provided by:
Competitive State Research Financing of the Expert Responsibility area of Tampere University Hospital
Tampere University Hospital Support Foundation, Tampere University Hospital
Received: 9 December 2019
Accepted: 17 April 2020
First Online: 13 May 2020
Ethics approval and consent to participate
: The research work has been conducted with the written informed consent of participants and according to the principles expressed in the Helsinki declaration. The research protocol of the sample collection has been approved by the ethics committee of the city of Tampere (1592/403/1996).
: Not applicable.
: The authors declare that they have no competing interests.