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Comparison of PICP and ICTP between COPD and control groups.
Notes: (A) Serum levels of PICP. (B) Serum levels of PICP in subjects with COPD and/or smoking habits. (C) Serum levels of ICTP. Data are graphed as mean ± SD. *P<0.05. Error bars show standard error.
Abbreviations: PICP, procollagen type I C-terminal peptide; ICTP, C-terminal telopeptide of type I collagen.
