1 Respiratory Department, Hospital Ramón y Cajal and Medicine Department, Universidad de Alcalá (IRYCIS), Madrid, Spain.
2 CHU Saint-Etienne, Service d'accueil des Urgences, France.
3 CHU Saint-Etienne, Service de Médecine Vasculaire et Thérapeutique, France.
4 Department of Internal Medicine, Hospital Clinico Universitario Virgen de la Arrixaca, Murcia, Spain.
5 Biostatistics Unit, Ramón y Cajal Hospital and Instituto Ramón y Cajal de Investigación Sanitaria IRYCIS, CIBER Epidemiología y Salud Pública (CIBERESP), Madrid, Spain.
6 Department of Internal Medicine, Hospital La Paz, Madrid, Spain.
7 Divisions of Pulmonary and Critical Care Medicine and General Medical Sciences, Washington University School of Medicine, St Louis, Mo.
8 Department of Internal Medicine, Hospital Universitari Germans Trias i Pujol, Universidad Católica de Murcia, Badalona, Spain.