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Ruthrapriya Muventhran; Sivakumar Chinnusamy; Pradeepa Mani. Effectiveness Of Incentive Spirometer Versus Lung Flute Machine Along With Chest Physiotherapy on Mucus Clearance And Fvc & Fev1 Among Subjects With Hospital Acquired Pneumonia - A Comparative. ijppr 1, 15, 29-41.