MyoclonusEpilepsies, MyoclonicMyoclonic Epilepsies, ProgressiveSeverity of Illness IndexLafora DiseaseUnverricht-Lundborg SyndromeCystatin BClonazepamReflex, AbnormalMyoclonic Cerebellar DyssynergiaEvoked Potentials, SomatosensoryMERRF SyndromeProtein Tyrosine Phosphatases, Non-ReceptorLisurideMuscle RigidityElectroencephalographyElectromyographyCerebellar AtaxiaAtaxia