title: The ketchup-bottle method.
mesh_terms: D001980:Bronchi / Q000378:metabolism*; D006801:Humans; D008173:Lung Diseases, Obstructive / Q000628:therapy; D026741:Physical Therapy Modalities; D011014:Pneumonia / Q000628:therapy; D012138:Respiratory Therapy; D013183:Sputum