1 Department of Child Neurology, Second School of Medicine, Charles University Prague, V uvalu 84, 150 06 Praha 5, Czech RepublicDepartment of Neurology, Second School of Medicine, Charles University Prague, V uvalu 84, 150 06 Praha 5, Czech RepublicDepartment of Biology and Medical Genetics, Second School of Medicine, Charles University Prague, V uvalu 84, 150 06 Praha 5, Czech RepublicInstitute of Human Genetics, University Erlangen, Schwabachanlage 10, 910 54 Erlangen, Germany.