RT Journal Article SR Electronic T1 Definitions of Cerebral Palsy and Their Role in Epidemiologic Research JF Neurology JO Neurology FD Lippincott Williams & Wilkins SP 641 OP 641 DO 10.1212/WNL.7.9.641 VO 7 IS 9 A1 Leonard T. Kurland YR 1957 UL http://n.neurology.org/content/7/9/641.abstract AB