biostudies-literatureUnknown20(Suppl 1)The journal of headache and pain109https://www.ebi.ac.uk/biostudies/studies/S-EPMC6904992biostudies-literature13^th European Headache Federation Congress 2019 - Abstracts : May 30^th to June 1^st 2019. Athens, Greece.PMC6904992false13^th European Headache Federation Congress 2019 - Abstracts : May 30^th to June 1^st 2019. Athens, Greece.2019-01-01T00:00:00Z2019 Dec2025-04-19T19:32:12.672Z2025-04-19T19:32:12.672ZS-EPMC69049923182227110.1186/s10194-019-1049-1