Fractional Exhaled Nitric Oxide Guided-Therapy in Chronic Obstructive Pulmonary Disease: A Stratified, Randomized, Controlled Trial Kang-Cheng Su; Hsin-Kuo Ko; Yi-Han Hsiao; Kun-Ta Chou; Yen-Wen Chen; Wen-Kuang Yu; Sheng-Wei Pan; Jia-Yih Feng; Diahn-Warng Perng;

Etiotypes in COPD: a pro/con debate Alvar Agusti; Marc Miravitlles;

Criteria for Advanced COPD in Patients Hospitalized Due to COPD Exacerbation: Prevalence and Predictive Capacity Alberto Fernández-Villar; Alberto Fernández-García; Cristina Represas-Represas; Rafael Golpe; Juan Marco Figueira-Gonçalves; Javier de Miguel-Díez; Marc Miravitlles;