Use of oscillatory positive expiratory pressure (OPEP) devices to augment sputum clearance in COPD: a systematic review and meta-analysis.
Saeed Mardy AlghamdiRuth Emily BarkerAbdullah S S AlsulayyimAli M AlasmariWinston A S BanyaMichael I PolkeySurinder S BirringNicholas S HopkinsonPublished in: Thorax (2020)
CRD 42016041835.