Are self-reports of breathing effort and breathing distress stable and valid measures among persons with asthma, persons with COPD, and healthy persons?
Meek PM, Lareau SC, Hu J. Are self-reports of breathing effort and breathing distress stable and valid measures among persons with asthma, persons with COPD, and healthy persons? Heart Lung. 2003 Sep-Oct; 32(5):335-46.