Many research networks have well developed sub groups, established to tackle specific problems within their specialty. The Paediatric Emergency Research Canada (PERC) network has a concussion work group and has some produced some really useful long term follow-up data from their Predicting Persistent Postconcussive Problems in Paediatrics prospective, multicenter cohort study. van Ierssel J, et al. [J Pediatr 2021;228:190–198.E3. https://doi.org/10.1016/j.peds.2020.08.061] have characterised symptom burden, school function, and physical activity in youth following acute concussion and those with subsequent repeat concussion. There were 3052 children aged between ages 5 and 18 years who …