Compared to PT alone what was the result of the best pharmacological therapy (PT) and Intrapulmonary percussive ventilation (IPV) or PT group with high-frequency chest wall oscillation (HFCWO)  on mMRC, BCSS, and CAT scores?
 Moreover, IPV patients showed an improvement in BCSS (p<0.001) and CAT (p<0.02) scores in comparison with HFCWO