Ethirajan Nandagopal, Sumithra M and Meenakshi N (2020) “Comparison of Prevalence and Risk Factors in COPD Patients With and Without History of Smoking”, International Journal of Research in Pharmaceutical Sciences, 11(4), pp. 7841–7847. Available at: https://ijrps.com/home/article/view/2478 (Accessed: 22 November 2024).