ESDPPP 2019 Poster Presentations P74 Rituximab effect on B cell depletion in paediatric patients with autoimmune diseases: a retrospective dose-response analysis of an observational study Free S Pan1, H Yu1,2, A Surti3, I Cheng4, SD Marks1,4, PA Brogan1,4, D Eleftheriou1,4, JF Standing1,4 1University College London Institute of Child Health, London, UK 2Novartis Pharmaceuticals AG, Basel, Switzerland 3School of Pharmacy, University College London 4Great Ormond Street Hospital for Children NHS...