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- Community determinants of COPD exacerbations in elderly patients in Poland: protocol for a retrospective Big Data observational cohort studyIzabela Zakowska, Katarzyna Kosiek, Anna Kowalczyk, Jacek Grabowski, Maciek Godycki-CwirkoBMJ Open Jun 2019, 9 (6) e030524; DOI: 10.1136/bmjopen-2019-030524
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