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Safety and Efficacy of 4-weeks Treatment of BIBW 2948 BS in Patients With Chronic Obstructive Bronchitis
The primary objective of this study is to investigate the effect of 4-week treatment with 7.5 mg b.i.d, 15 mg q.d and 15 mg b.i.d. BIBW 2948 BS and placebo on cough and sputum as determined by the CASA-Q (Cough and Sputum Assessment Questionnaire
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