1 Servicio de Pediatria, Hospital de Terrassa, Consorci Sanitari de Terrassa, Barcelona, Spain. Electronic address: amartinez@cst.cat.
2 SAMUR-Protección Civil. Madrid, Spain.
3 Servicio de Pediatria, Hospital Universitario Germans Trias i Pujol. Badalona, Spain.
4 Intensive Care and Emergency Medicine Departments, University Hospital Ghent and Ghent University, Gante, EMS Dispatch Center, East and West Flanders, Federal Department of Health, Belgium.