Is group C really needed as a separate group from D in COPD? A single-center cross-sectional study E.E. Yazar; B. Yi..itba..; E.Y. Niksarl..o..lu; M. Bayraktaro..lu; S. Kul;

Prevalence of pulmonary hypertension in COPD patients living at high altitude C. Aguirre-Franco; CA. Torres-Duque; G. Salazar; A. Casas; C. Jaramillo; M. Gonzalez-Garcia;

Genetic variation of six specific SNPs of chronic obstructive pulmonary disease among Chinese population J. Jing; D. Xu; Z. Li; J. Wang; J. Dai; F.S. Li;