Au DH, Blough DK, Kirchdoerfer L, Weiss KB, Udris EM, Sullivan SD. Development of a quantifiable symptom assessment tool for patients with chronic bronchitis: the Chronic Bronchitis Symptoms Assessment Scale. COPD. 2005 Jun;2(2):209-16.
Au DH, Blough DK, Kirchdoerfer L, Weiss KB, Udris EM, Sullivan SD. Development of a quantifiable symptom assessment tool for patients with chronic bronchitis: the Chronic Bronchitis Symptoms Assessment Scale. COPD. 2005 Jun;2(2):209-16.