Rosy, Sharkia Khanam, et al. “Vitamin D and it’s Association With FokI VDR Polymorphism in Patients With Asthma-COPD Overlap”. Journal of Rangpur Medical College, vol. 9, no. 1, May 2024, pp. 22-27, doi:10.3329/jrpmc.v9i1.72709.