Change in inhaled corticosteroid treatment and COPD exacerbations: an analysis of real-world data from the KOLD/KOCOSS cohorts by Se Hee Lee, Ji-Hyun Lee, Ho Il Yoon, Hye Yun Park, Tae-Hyung Kim, Kwang Ha Yoo, Yeon-Mok Oh, Ki Suk Jung, Sang-Do Lee, Sei Won Lee

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