IJSR International Journal of Scientific Research 2277 - 8179 Indian Society for Health and Advanced Research ijsr-13-11-60206 Original Research Paper Impact Of Vitamin-D Deficiency On Clinical Outcomes And Microbial Dynamics In Acute Exacerbations Of COPD: A Comparative Study G Madhuri Dr. Dr Chethan Subramanya Dr. November 2024 13 11 01 02