Magnus Landgren1,2,3,4. 1. Department of Paediatrics, Skaraborg Hospital Mariestad, Mariestad, Sweden. 2. Skaraborg Hospital Research Unit, Skövde, Sweden. 3. Department of Paediatrics, University of Gothenburg, Gothenburg, Sweden. 4. Institute of Neuroscience and Physiology, Gillberg Neuropsychiatry Centre of Gothenburg, Gothenburg, Sweden.