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. 2019 Dec 6;60(1):28–39. doi: 10.1111/head.13701

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© 2019 The Authors. Headache: The Journal of Head and Face Pain published by Wiley Periodicals, Inc. on behalf of American Headache Society

This is an open access article under the terms of the http://creativecommons.org/licenses/by-nc-nd/4.0/ License, which permits use and distribution in any medium, provided the original work is properly cited, the use is non‐commercial and no modifications or adaptations are made.

PMC Copyright notice

The 6‐Item Headache Impact Test™ (HIT‐6™); (© 2001, 2015 QualityMetric Incorporated and the GlaxoSmithKline Group of Companies. All rights reserved. HIT‐6™ United States [English] Version. Reprinted with permission).