Mirjada, Md Rashed, Md Habib Hassan, Md Naoshad Khan, Enshad Ekram Ullah, Anupam Barua, Tanzila Tabib Chowdhury, and Kazi Md Abrar Hasan. “Association of Vitamin D Level and Forced Expiratory Volume in First Second in COPD Patients”. Journal of Chittagong Medical College Teachers' Association 30, no. 2 (January 24, 2020): 22–25. Accessed July 17, 2024. https://banglajol.info/index.php/JCMCTA/article/view/62579.