Mohanty T, Patro M, Sahoo J, Meher BK, Pattnaik M, Patra JK. Effectiveness of pneumococcal vaccine in patients with chronic obstructive pulmonary disease (COPD). Int J Res Med Sci [Internet]. 2018 Oct. 25 [cited 2025 Oct. 14];6(11):3698-704. Available from: https://www.msjonline.org/index.php/ijrms/article/view/5493