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lung health medical logo icon vector pulmonology medicine lungs cancer care diagnosis disease medic doctor physician control hospital clinic treatment stethoscope stethescope healthy infection virus copd sars asthma pneumonia tuberculosis bronchitis illness tumour coughing cough chronic respiration respiratory pulmonary bronchus bronchi bronchial sign pictogram silhouette diagnose pulmonologist awareness day illustration concept chest research diagnostic therapy stetoscope isolated background abstract icons signs logos clipart web design flat white