Direct Switch from Tiotropium to Indacaterol/Glycopyrronium in Chronic Obstructive Pulmonary Disease Patients in Korea by Sang Haak Lee, Chin Kook Rhee, Kwangha Yoo, Jeong Woong Park, Suk Joong Yong, Jusang Kim, Taehoon Lee, Seong Yong Lim, Ji-Hyun Lee, Hye Yun Park, Minyoung Moon, Ki-Suck Jung

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