Funding for this research was provided by:
Austrian Science Fund (P 29628)
Received: 17 April 2019
Accepted: 27 August 2019
First Online: 3 September 2019
Ethics approval and consent to participate
: The study was part of the FWF-project P 29628 and approved by the institutional ethics and animal welfare committee and the national authority according to §§ 26ff. of Animal Experiments Acts, TVG 2012, Austria (BMWFW-68.205/0036-WF/V/3b/2017). The collection of bird blood samples in Lithuania was approved by the Environmental Protection Agency Lithuania (permit 2018-04-13, no. 24).
: Not applicable.
: The authors declare that they have no competing interests.