Received: 14 July 2019
Accepted: 6 February 2020
First Online: 22 February 2020
Ethics approval and consent to participate
: Informed consent was obtained from all the individuals who participated in the study. All procedures involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and conformed to the 1964 Helsinki declaration and its later amendments or comparable ethical standards. Ethical approval for the study was granted by the Ethical Review Board of Gothenburg and the Ethical Review Board of Umeå, Sweden (permit no. 673-16).
: Not applicable.
: The authors declare that they have no competing interests.