RT Journal Article SR Electronic T1 The Eaton Collaborative Study of levodopa therapy in parkinsonism JF Neurology JO Neurology FD Lippincott Williams & Wilkins SP 46 OP 59 DO 10.1212/WNL.20.12_Part_2.46 VO 20 IS 12 Part 2 A1 Robert E. Keenan YR 1970 UL http://n.neurology.org/content/20/12_Part_2/46.abstract AB