1 Respiratory Department, Hospital Ramón y Cajal and Instituto Ramón y Cajal de Investigación Sanitaria IRYCIS, Madrid, Spain.
2 Biostatistics Department, Ramón y Cajal Hospital and Instituto Ramón y Cajal de Investigación Sanitaria IRYCIS, CIBERESP, Madrid, Spain.
3 Hospital at Home Unit, Complexo Hospitalario Universitario de A Coruña (CHUAC), Servizo Galego de Saúde (SERGAS), A Coruña, Spain.
4 Cardiovascular Medicine Division, Brigham and Women's Hospital, Harvard Medical School, Boston, MA, USA; Center for Outcomes Research and Evaluation (CORE), Yale University School of Medicine. New Haven, CT, USA; Cardiovascular Research Foundation, New York, USA.
5 Respiratory Department, Hospital Puerta de Hierro, Madrid, Spain.
6 Respiratory Department, Hospital Ramón y Cajal and Instituto Ramón y Cajal de Investigación Sanitaria IRYCIS, Madrid, Spain; Medicine Department, Universidad de Alcalá, Madrid, Spain; CIBER Enfermedades Respiratorias (CIBERES), Madrid, Spain. Electronic address: [email protected].