Langenfeld, Anke, Antonia Pia Gassner, Brigitte Wirth, Malin Beth Mühlemann, Luana Nyirö, Caroline Bastiaenen, and Jaap Swanenburg. “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”. Archives of Physiotherapy 12, no. 1 (October 17, 2022). Accessed July 22, 2024. https://journals.aboutscience.eu/index.php/aop/article/view/2803.