1. Department of Neurology I.C., “Oasi” Institute for Research on Mental Retardation and Brain Aging (I.R.C.C.S.), Troina (EN), Italy
2. Clinic of Neurology and Psychiatry for Children and Youth, Belgrade, Serbia
3. Institute of Medical Statistics and Informatics, School of Medicine, University of Belgrade, Belgrade, Serbia
4. Institute of Neuroscience, Newcastle University, Newcastle, UK