title: The Gross Motor Function Classification System: 20 years on.
authors.affiliation: Children's Hospital of Eastern Ontario - Rehabilitation PSU, Ottawa, ON, Canada.
authors.forename: Anna
authors.initials: A
authors.lastname: Mccormick
mesh_terms: D002547:Cerebral Palsy; D006801:Humans; D009048:Motor Skills; D012720:Severity of Illness Index