“RETRACTED: Clinical Features and Outcomes of New Daily Persistent Headache in Patients in China and Comparison With Medication Overuse Headache: A Double-Center Retrospective Study”. Pain medicine 6, no. 1 (April 29, 2021): 10–20. Accessed July 10, 2026. https://painmedicine.org.ua/index.php/pnmdcn/article/view/246.