Associations of serum sclerostin levels with body composition, pulmonary function, and exacerbations in COPD patients C.A. Amado; M. García-Unzueta; J. Agüero; P. Martín-Audera; P. Fueyo; B.A. Lavín; A.R. Guerra; P. Muñoz; S. Tello; A. Berja; C. Casanova;