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Effect of Inhaled Magnesium Sulphate on Bronchodilating Response, Levels of Substance P and Clinical Improvement of Acute Exacerbations COPD Patients. J Respirol Indones [Internet]. 2018 Jan. 31 [cited 2025 Aug. 11];38(1):16-23. Available from: http://jurnalrespirologi.org/index.php/jri/article/view/135