A Phenomenology Study on Medical Delay in Patients with Acute Exacerbation of COPD 
JIANG Zongliang1WANG Haibo,WANG Yuyan,MA Lijun,SUN Naya,ZHANG Weihong
Chinese General Practice . 2020, (27): 3396 -3401 .  DOI: 10.12114/j.issn.1007-9572.2020.00.104