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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Impact of Air Pollution and Outdoor Temperature on the Rate of Chronic Obstructive Pulmonary Disease Exacerbations by Krachunov Iliya I., Kyuchukov Nikolay H., Ivanova Zlatina I., Yanev Nikolay A., Hristova Petkana A., Borisova Elena D., Popova Tsanya P., Pavlov Plamen S., Nikolova Pavlina T., Ivanov Yavor Y.

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