M. A. Amjad, Athar Mukhtar Siddiqui, Khalid Bashir, Ateeq Ur Rehman Ghafoor, and Romana Shaida Durrani, “Prevalence of chronic pain in Pakistan – a national survey”, J Pak Med Assoc, vol. 73, no. 6, pp. 1217–1220, May 2023.