Effect of negative aero-ions on patients with chronic obstructive lung diseases.
D000328:Adult; D000838:Anions / Q000627:therapeutic use*; D004311:Double-Blind Method; D005260:Female; D005541:Forced Expiratory Volume; D006801:Humans; D008173:Lung Diseases, Obstructive / Q000503:physiopathology / Q000628:therapy*; D008297:Male; D008875:Middle Aged; D010366:Peak Expiratory Flow Rate; D012138:Respiratory Therapy / Q000379:methods*
D000838:Anions