Serum osteoprotegerin (OPG) and osteopontin (OPN) in patients with COPD during two-year follow-up study
D. Dimov (Stara Zagora, Bulgaria), T. Tacheva (Stara Zagora, Bulgaria), Y. Zhelyazkova (Stara Zagora, Bulgaria), T. Vlaykova (Stara Zagora, Bulgaria)
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