{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,14]],"date-time":"2026-10-14T02:17:25Z","timestamp":1791944245254,"version":"4.3.4"},"reference-count":67,"publisher":"SAGE Publications","issue":"10","license":[{"start":{"date-parts":[[2025,10,1]],"date-time":"2025-10-01T00:00:00Z","timestamp":1759276800000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by-nc\/4.0\/"},{"start":{"date-parts":[[2025,10,1]],"date-time":"2025-10-01T00:00:00Z","timestamp":1759276800000},"content-version":"tdm","delay-in-days":0,"URL":"https:\/\/journals.sagepub.com\/page\/policies\/text-and-data-mining-license"}],"content-domain":{"domain":["journals.sagepub.com"],"crossmark-restriction":true},"short-container-title":["Cephalalgia"],"published-print":{"date-parts":[[2025,10]]},"abstract":"<jats:sec>\n                    <jats:title>Introduction<\/jats:title>\n                    <jats:p>The international headache classification has been enormously important promoting research and clinical management of patients with headache. It is a living document that develops from edition to edition and changes have been increasingly based on research, so called classification research. The aim of the present review is to present recent results of such research and to characterize the methods available for it.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Methods<\/jats:title>\n                    <jats:p>\n                      Published research was identified by systematic search of PubMed. Lists of references of identified articles and the table of content of the last five years of\n                      <jats:italic>Cephalalgia<\/jats:italic>\n                      were screened.\n                    <\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Results<\/jats:title>\n                    <jats:p>The major results of identified articles are summarized. Thereafter the different methodologies applied in these studies are described. Finally, some suggestions are made for the future consideration of the fourth classification committee.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Conclusion<\/jats:title>\n                    <jats:p>Classification research is emerging as an important avenue of headache research. It has a multitude of different designs available and many of them do not need advanced equipment.<\/jats:p>\n                  <\/jats:sec>","DOI":"10.1177\/03331024251377753","type":"journal-article","created":{"date-parts":[[2025,10,8]],"date-time":"2025-10-08T17:35:39Z","timestamp":1759944939000},"update-policy":"https:\/\/doi.org\/10.1177\/sage-journals-update-policy","source":"Crossref","is-referenced-by-count":3,"title":["Research to improve headache classification: Results, methods, and future challenges"],"prefix":"10.1177","volume":"45","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-6712-2702","authenticated-orcid":false,"given":"Jes","family":"Olesen","sequence":"first","affiliation":[{"name":"Department of Neurology and Danish Headache Center, Center for Translational Research TRACE, Rigshospitalet and University of Copenhagen, Copenhagen, Denmark"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"179","published-online":{"date-parts":[[2025,10,8]]},"reference":[{"key":"e_1_3_2_2_2","first-page":"1","article-title":"Classification and diagnostic criteria for headache disorders, cranial neuralgias and facial pain","volume":"7","author":"Headache Classification Committee of the International Headache Society","year":"1988","unstructured":"Headache Classification Committee of the International Headache Society. 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