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Shafuddin, E. et al. (2015). A double-blind, randomised, placebo-controlled study of roxithromycin and doxycycline combination, roxithromycin alone, or matching placebo for 12 weeks in adults with frequent exacerbations of chronic obstructive pulmonary disease. Journal of negative results in biomedicine. 14 (1), pp. 1-9. [Online].