1. Department of Anesthesiology and Critical Care MedicineHôpital Lapeyronie Montpellier France
2. Division of Pediatric Critical Care MedicineChildren's Hospital of Richmond at Virginia Commonwealth University Richmond Virginia USA
3. Inserm Unit Neuro Sciences Institute, University of Montpellier Montpellier France
4. Department of Medical StatisticsCHU Montpellier, University of Montpellier Montpellier France