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chronic obstructive lung diseasenon obstructive hydrocephaluschronic obstructive pulmonary disordercongenital obstructive hydrocephalusacute obstructive hydrocephalusobstructive hydrocephalus in adultschronic obstructive asthma symptomsmild obstructive hydrocephaluschronic obstructive breathingchronic obstructive airways diseasechronic emphysema treatmentcopd stands for chronic bronchitis