1. Pneumology Department, Hospital Universitario y Politécnico La Fe/Instituto de Investigación Sanitaria La Fe, Valencia, Spain
2. Ph.D. Program in Medicine and Translational Research, University of Barcelona, Barcelona, Spain
3. Centro de Investigación Biomédica En Red-Enfermedades Respiratorias CB06/06/0028, Madrid, Spain
4. Pneumology Department, Hospital Clínic/Institut D’Investigacions Biomèdiques August Pi i Sunyer, Universitat de Barcelona, Barcelona, Spain
5. Pneumology Department, Hospital de Galdakao-Usansolo, Galdakao, Spain; and
6. Intensive Care Unit, Hospital de Mataró, Barcelona, Spain