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Lee, S., Xie, C., Yunus, F., Itoh, Y., Ling, X., Yu, W., & Kiatboonsri, S. (2016). efficacy and tolerability of budesonide/formoterol added to tiotropium compared with tiotropium alone in patients with severe or very severe COPD: A randomized, multicentre study in East Asia. Respirology, 21(1), 119–127. http://access.bl.uk/ark:/81055/vdc_100028063251.0x000022