Categorization of COPD patients in Turkey via GOLD 2013 strategy document: ALPHABET study by Gunen H, Yilmaz M, Aktas O, Ergun P, Ortakoylu MG, Demir A, Cetinkaya P, Gurgun A, Otlu M, Cilli A, Yilmaz U, Kokturk N, Candemir I, Yakar HI, Ar I, Konya A

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