Stability of Frequent Exacerbator Phenotype in Patients with Chronic Obstructive Pulmonary Disease by Krachunov Iliya, Kyuchukov Nikolay, Ivanova Zlatina, Yanev Nikolay A., Hristova Petkana A., Pavlov Plamen, Glogovska Pavlina, Popova Tsanya, Ivanov Yavor Y.

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