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Booth, H., Fishwick, K., Harkawat, R., Devereux, G., Hendrick, D. J., & Walters, E. H. (1993). changes in methacholine induced bronchoconstriction with the long acting beta 2 agonist salmeterol in mild to moderate asthmatic patients.. Thorax, 48(11), 1121–1124. http://access.bl.uk/ark:/81055/vdc_100135553087.0x00002f