J Headache Pain. 2016;17:9. doi: 10.1186/s10194-016-0599-8. Epub 2016 Feb 16. Interictal burden attributable to episodic headache: findings from the Eurolight project. Lampl C1,2, Thomas H3, Stovner LJ3,4, Tassorelli C5,6, Katsarava Z7,8, Laínez JM9, Lantéri-Minet M10,11, Rastenyte D12, Ruiz de la