Prasad, Sanjay, Abhay Paliwal, and Ram Ghulam Razdan. “A Cross-Sectional Study of Pain Severity in Patients Suffering from Different Types of Primary Headache in the Hospital Setting”. International Journal of Research in Medical Sciences 8, no. 5 (April 27, 2020): 1740–1744. Accessed May 5, 2026. https://www.msjonline.org/index.php/ijrms/article/view/7967.