Hassan, S.; Ali, T.; Bennoor, K. S.; Hossain, M. A.; Rahman, M.; Khan, M. A. S.; Rosy, S. K.; Nahar, S. B.; Mahmood, M. B. Vitamin D3 – Does It Correlate With Exercise Tolerance in Stable COPD?. J Bangladesh Soc Physiol 2019, 14, 14-20.