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APA Citation
Qin, Y., Li, R., Wu, G., Zhu, Z., Liu, J., Zhou, C., Guan, W., Luo, J., Yu, X., Ou, Y., Jiang, M., Zhong, N., & Luo, Y. (n.d.). effect of tiotropium on neural respiratory drive during exercise in severe COPD. Pulmonary pharmacology & therapeutics, 30, 51–56. http://access.bl.uk/ark:/81055/vdc_100042271283.0x000013