Combined stimulation of inspiratory and expiratory muscles for pulmonary rehabilitation in stable COPD patients

LI Bo-jun, ZHAO Xiao-yun△, HU Xiu-juan, ZHANG Li, LI Guan-hua, YANG Xue-jin, LI Yue-chuan

Tianjin Medical Journal . 2020, (9): 857 -861 . DOI: 10.11958/20200100