https://clinicaltrials.gov/ct2/show/NCT03781895?type=Intr&cond=COPD&phase=01234&sfpd_d=14&sort=nwst&sel_rss=new14 Effect of Vitamin D3 on Lung Function and Exercise Tolerance in COPD Patients Condition : Stable COPD Patients Intervention : Drug: Cholecalciferol Sponsor : Bangabandhu Sheikh Mujib Medical University, Dhaka, Bangladesh Completed NCT03781895 Thu, 20 Dec 2018 12:00:00 EST >>> updated dec 25, completed