Spanish COPD Guidelines (GesEPOC) 2021 Update. Diagnosis and Treatment of COPD Exacerbation Syndrome Juan José Soler-Cataluña, Pascual Piñera, Juan Antonio Trigueros, Myriam Calle, Ciro Casanova, Borja G. Cosío, José Luis López-Campos, Jesús Molina, Pere Almagro, José-Tomás Gómez, Juan Antonio Riesco, Pere Simonet, David Rigau, Joan B. Soriano, Julio Ancochea, Marc Miravitlles

N-acetylcysteine Treatment in Chronic Obstructive Pulmonary Disease (COPD) and Chronic Bronchitis/Pre-COPD: Distinct Meta-analyses Alberto Papi, Franco Alfano, Tommaso Bigoni, Lorenzo Mancini, Amal Mawass, Federico Baraldi, Cristina Aljama, Marco Contoli, Marc Miravitlles

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