Funding for this research was provided by:
A.P. Møller og Hustru Chastine Mc-Kinney Møllers Fond til almene Formaal
International Headache Society (fellowship)
The Candy foundation
Received: 7 February 2020
Accepted: 27 May 2020
First Online: 9 June 2020
Consent for publication
: Not applicable.
: The authors declare that they have no competing interests.