Definition and Criteria for Diagnosing Primary Dysmenorrhea: A Modified Delphi Procedure. - Özcan H; Albana J; Yarde F; Dekker JJML; Roos EJ; Goverde AJ; van Dorp W; Ortiz MI; Hewitt GD; Simms-Cendan J; Al-Jefout M; Cooper N; et al. (Journal of pediatric and adolescent gynecology, 2026)