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Lokesh, K. S. and Chaya, S. K. and Jayaraj, B. S. and Praveena, A. S. and Krishna, Murali and Madhivanan, Purnima and Mahesh, P. A. (2020) Vitamin D deficiency is associated with chronic obstructive pulmonary disease and exacerbation of COPD. Clinical Respiratory Journal. ISSN 1752-699X