Olsson, Jan http://orcid.org/0000-0001-9094-319X
Johansson, Jörgen
Honkala, Emma
Blomqvist, Bert
Kok, Eloise
Weidung, Bodil
Lövheim, Hugo
Elgh, Fredrik
Article History
Received: 31 August 2018
Accepted: 31 January 2019
First Online: 14 February 2019
Ethics approval and consent to participate
: The Regional Ethical Review Board in Umeå approved the study of Betula samples (2017/17–31). Clinical samples were de-identified and not traceable to individuals.
: Not applicable.
: The authors declare that they have no competing interests.
: Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.