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Federica Novelli, Laura Malagrinò, Federico L Dente & Pierluigi Paggiaro. (2012) Efficacy of anticholinergic drugs in asthma. Expert Review of Respiratory Medicine 6:3, pages 309-319.
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Umair Gauhar, Mark Dransfield & J Allen D Cooper. (2009) Sequential comparison of tiotropium to high-dose ipratropium in patients with chronic obstructive pulmonary disease in a practice setting. International Journal of Chronic Obstructive Pulmonary Disease 4, pages 391-395.
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