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;

Sex- differences in alpha-1 antitrypsin deficiency: Data from the EARCO Registry Hilal Ersöz; María Torres-Durán; Alice M. Turner; Hanan Tanash; Carlota Rodríguez García; Angelo Guido Corsico; José Luis López-Campos; Marc Miravitlles; Christian F. Clarenbach; Kenneth R. Chapman; Jose Mª Hernández Pérez; Catarina Guimarães; Eva Barto¿ovská; Timm Greulich; Miriam Barrecheguren; Andreas Rembert Koczulla; Philipp Höger; Arturo Olivares Rivera; Felix Herth; Franziska C. Trudzinski;