Preserved Ratio Impaired Spirometry in US Primary Care Patients Diagnosed with Chronic Obstructive Pulmonary Disease by Evans A, Tarabichi Y, Pace WD, Make B, Bushell N, Carter V, Chang KL, Fox C, Han MK, Kaplan A, Kocks JWH, Le Lievre C, Roussos A, Skolnik N, Soriano JB, Yawn BP, Price D

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