1. Virology Department
2. Intensive Care Unit, and
3. Intensive Care Unit, Paoli Calmette Institute, Marseille, France
4. Intensive Care Unit, AP-HP, Cochin Teaching Hospital, Paris, France
5. Statistics Department, AP-HP, Saint Louis Teaching Hospital, Paris, France
6. Intensive Care Unit, Angers Teaching Hospital, Angers, France
7. Intensive Care Unit, AP-HP, Pitié Salpêtrière Teaching Hospital, Paris, France
8. Intensive Care Unit, AP-HP, Avicennes Teaching Hospital, Bobigny, France
9. Intensive Care Unit, Roubaix Regional Hospital Center, Roubaix, France
10. Intensive Care Unit, Versailles Teaching Hospital, Le Chesnay, France
11. Intensive Care Unit, District Hospital Center, La Roche sur Yon, France
12. Intensive Care Unit, Brabois Teaching Hospital, Nancy, France
13. Intensive Care Unit, Jules Bordet Institute, Brussels, Belgium
14. Intensive Care Unit, Ghent University Hospital, Ghent, Belgium
15. Intensive Care Unit, Grenoble Teaching Hospital, Grenoble, France; and
16. Intensive Care Unit, Regional Teaching Hospital, Lille, France