SLC2A1 and alternating hemiplegia of childhood: Thirty-nine per cent (9/23) of children and 56% (10/18) of adults who completed the studyreturned the study diaries with quantifiable records of seizures or (for one individualwith GLUT1-DS and one individual with AHC) paroxysmal non-epileptic events.Physician-documented seizure/event counts were reviewed for all others; four children hadinsufficient data to allow for quantification of seizures.