1. Department of Anaesthesia, Intensive Care Medicine and Pain Therapy; Medical University of Vienna; Vienna; Austria
2. Regina Margherita Children's Hospital; Turin; Italy
3. Ann & Robert H Lurie Children's Hospital of Chicago; Northwestern University's Feinberg School of Medicine; Chicago; IL; USA
4. Departments of Anesthesia; American British Cowdray Medical Center and Instituto Nacional de Rehabilitación; México City; México
5. Department of Anesthesiology and Pain Medicine; Seattle Children's Hospital; Seattle Children's Hospital; Seattle; WA; USA