From the UCLouvain, Brussels, Belgium (FV), Department of Anaesthesia and Critical Care Medicine, Paediatric Anaesthesia Unit, Montpellier University Hospital, Institute of Functional Genomics (IGF), University of Montpellier, CNRS, INSERM, Montpellier, France (CS), Department of Anesthesia, Adrz-Erasmus MC, Goes, The Netherlands (JCdG), Department of Anaesthesia and Intensive Care, Cnopf Children's Hospital – Hospital Hallerwiese, Nürnberg, Germany (KB), Department of Paediaric Anaesthesiology and Intensive Care, Wroclaw Medical University, Wroclaw, Poland (MZ), Department of Anaesthesia & Intensive Care, Akershus University Hospital and Olso University, Oslo, Norway (TGH), Department of Anaesthesia and Pain Management, Great Ormond Street Hospital NHS Foundation Trust, London, UK (SMW), Unit for Research in Anaesthesia, IRCCS, Istituto G Gaslini, Genova, Italy (ND), and Department of Anaesthesiology, Pharmacology, Intensive Care and Emergency Medicine, University Hospitals of Geneva, Geneva, Switzerland (WH)

Correspondence to Francis Veyckemans, Hugo Verriest Str 19, B 1140 Brussels, Belgium. Tel: +32 496 785811; e-mail: [email protected]