1. Medical ICU, Saint-Louis Teaching Hospital, Paris, France;
2. Department of Biostatistics, Saint-Louis Teaching Hospital, Paris, France;
3. ICU, Paoli Calmette Institute, Marseille, France;
4. ICU, Cochin Teaching Hospital, Paris, France;
5. Medical ICU, Angers Teaching Hospital, Angers, France;
6. Medical ICU, Pitié-Salpétrière Teaching Hospital, Paris, France;
7. ICU, Avicenne Teaching Hospital, Bobigny, France;
8. ICU, Roubaix Hospital, Roubaix, France;
9. ICU, Mignot Hospital, Versailles, France;
10. Respiratory Unit, Cochin Teaching Hospital, Paris, France;
11. ICU, CH Vendée, La Roche sur Yon, France;
12. ICU, Brabois Teaching Hospital, Nancy, France;
13. Service soins intensifs et urgences oncologiques, Institut Jules Bordet, Brussels, Belgium;
14. ICU, Ghent Teaching Hospital, Ghent, Belgium;
15. ICU, Albert Michallon University Hospital, Grenoble, France;
16. ICU, Saint-Etienne University Hospital, Saint-Etienne, France