Funding for this research was provided by:
Eesti Teadusagentuur (PUT1239, PRG957)
Received: 26 October 2019
Accepted: 26 November 2019
First Online: 30 November 2019
Compliance with ethical standards
: The authors declare that they have no competing interests.
: This study was approved by the Animal Ethics Committee of the Estonian Ministry of Agriculture (permit 21.11.12/121). Imaging procedures were approved and authorised by the National Animal Experiment Board in Finland (ESAVI/4706/04.10.03/2011). Experiments were performed in accordance with Good Laboratory Practices for Animal Research.