with me now is dr michael absoud, a consultant in paediatric neurodisability at evelina london children s hospital and a senior author of the study. good to have you with this doctor. can you give us a sense of the fieldwork that you did, where you got your data from. fieldwork that you did, where you got your data from. yes, so this was art of got your data from. yes, so this was part of the got your data from. yes, so this was part of the covid-19 got your data from. yes, so this was part of the covid-19 symptom i got your data from. yes, so this was part of the covid-19 symptom app i part of the covid 19 symptom app that many people know. there is over 4 million people registered on the app. we had over a quarter million families, where 75,000 parents had the children tested for covid 19. eventually, we had a cohort of over 1700 children who had tested positive. we compared that you what