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What is the clinical definition of chronic bronchitis?A - a productive cough and sputum for 6 months in 2 consecutive yearsB - a productive cough and sputum for 3 months in 2 consecutive yearsC - a productive cough and sputum for 9 months in 2 consecutive yearsD- a productive cough and sputum for 6 months in 3 consecutive yearsE - a productive cough and sputum for 9 months in 3 consecutive years
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