Funding for this research was provided by:
International Headache Society (none)
Received: 1 October 2019
Accepted: 23 January 2020
First Online: 7 February 2020
Ethics approval and consent to participate
: The study followed the guidelines of the European Communities Council (86/609/ECC) and was approved by the Regional Ethical Committee on Animal Research, Malmö/Lund, Sweden (M17–15).
: All authors approved the publication of this paper.
: The authors declare that they have no competing interests.