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;

Risk validation of a new quantitative score for clinical control of chronic obstructive pulmonary disease: The RADAR score Juan José Soler-Cataluña; María Villagrasa; Pablo Catalán; Bernardino Alcázar-Navarrete; Myriam Calle Rubio; Marc Miravitlles;