1. Geneva University Hospitals; Division of Clinical Pharmacology and Toxicology, Department APSI; Hopital Cantonal de Geneve Geneva Switzerland 1211
2. School of Dentistry, The University of Manchester; Cochrane Oral Health Group; J R Moore Building, Oxford Road Manchester UK
3. School of Dentistry, The University of Manchester; JR Moore Building Oxford Road Manchester UK M13 9PL
4. Geneva University Hospitals; Division of Anaesthesiology, Department APSI; 4 Gabrielle-Perret-Gentil Geneva Switzerland 1211