High altitudes and partial pressure of arterial oxygen in patients with chronic obstructive pulmonary disease - A systematic review and meta-analysis A. Sevik; T. Gaisl; A. Forrer; L. Graf; S. Ulrich; K.E. Bloch; M. Lichtblau; M. Furian;

Clinical usefulness of serum angiotensin converting enzyme in silicosis J. Blanco-Pérez; Á. Salgado-Barreira; S. Blanco-Dorado; M.E. González Bello; A.C. Caldera Díaz; A. Pérez-Gonzalez; A. Pallarés Sanmartín; A. Fernández Villar; F.J. Gonzalez-Barcala;

Synonymous mutations in TLR2 and TLR9 genes decrease COPD susceptibility in the Chinese Han population X. Ding; Q. Lin; J. Zhao; Y. Fu; Y. Zheng; R. Mo; L. Zhang; B. Zhang; J. Chen; T. Xie; H. Wu; Y. Ding;