Developmental and epilepsy outcomes at age 4 years in the UKISS trial comparing hormonal treatments to vigabatrin for infantile spasms: a multi-centre randomised trial. - Darke K; Edwards SW; Hancock E; Johnson AL; Kennedy CR; Lux AL; Newton RW; O'Callaghan FJ; Verity CM; Osborne JP; Trial Steering Committee (Archives of Disease in Childhood, 2010)