1. Department of Paediatrics, Imperial College School of Medicine, Hammersmith Campus, London, United Kingdom
2. Department of Paediatric Neurology and Psychiatry, Catholic University, Rome, Italy
3. Department of Paediatric Neurology and Psychiatry, Stella Maris Institute, Pisa, Italy
4. Department of Paediatrics and Child Neurology, Turku University Central Hospital, Turku, Finland