https://clinicaltrials.gov/ct2/show/NCT03900195?type=Intr&cond=COPD&sfpd_d=14&sel_rss=new14 The Effectiveness of Bottle-PEP in Chronic Obstructive Pulmonary Disease Condition : Chronic Obstructive Pulmonary Disease Intervention : Other: BottlePEP Sponsor : Marmara University Recruiting NCT03900195 Tue, 02 Apr 2019 12:00:00 EDT Phase N/A