1. Division of Anesthesiologic Investigations, University of Geneva, 1211 Geneva;
2. Division of Anesthesia, Geneva Children's Hospital, 1205 Geneva, Switzerland;
3. Department of Medical Informatics and Engineering, University of Szeged, Szeged 6720, Hungary; and
4. Division of Clinical Sciences, Institute for Child Health Research and Centre for Child Health Research, University of Western Australia, Perth 6008, Australia