Rahman, N., and U. . Ullah. “Preserved Ratio Impaired Spirometry (PRISm) in Mardan: A Retrospective Prevalence Study of Spirometric Patterns and Associated Comorbidities”. Pakistan Journal of Chest Medicine, vol. 32, no. 1, Mar. 2026, pp. 11-17, https://pjcm.net/index.php/pjcm/article/view/1106.