Acute Exacerbation According to GOLD 2017 Categories in Patients with Chronic Obstructive Pulmonary Disease Joohae Kim, Chang-Hoon Lee, Myung-Goo Lee, Kyeong-Cheol Shin, Kwang Ha Yoo, Seong Yong Lim, Ju Ock Na, Chul-Gyu Yoo, Ki Suck Jung, Sang-Do Lee

The Influence of Lung Function and Respiratory Muscle Strength on Quadriceps Muscle Fatigability in COPD Patients Under Long-term Oxygen Therapy Mara Paneroni, Alessandro Cavicchia, Salvi Beatrice, Laura Bertacchini, Massimo Venturelli, Michele Vitacca

Serum Levels of Alpha1-antitrypsin and Their Relationship With COPD in the General Spanish Population Sabina Janciauskiene, David S. DeLuca, Miriam Barrecheguren, Tobias Welte, Marc Miravitlles