1. Department of Anaesthesiology; Institut Claudius Regaud; IUCT-O; Toulouse France
2. Pharmacoepidemiology Research Unit; INSERM 1027; University of Toulouse; Toulouse France
3. Department of Anaesthesiology; CHU Purpan; Toulouse France
4. Department of Anaesthesiology and Critical Care; CH Hotel Dieu; Narbonne France
5. Department of Anaesthesiology; Wansbeck General Hospital; Ashington UK