Responsiveness of the German version of the Neck Disability Index in chronic neck pain patients: a prospective cohort study with a seven‑week follow‑up. Arch. Physioter [Internet]. 2022 Oct. 17 [cited 2026 Aug. 5];12(1). Available from: https://www.archivesofphysiotherapy.com/index.php/aop/article/view/2803