RT Journal Article SR Electronic T1 Psychiatric changes in patients treated with levodopa JF Neurology JO Neurology FD Lippincott Williams & Wilkins SP 23 OP 30 DO 10.1212/WNL.20.12_Part_2.23 VO 20 IS 12 Part 2 A1 Walter Knopp YR 1970 UL http://n.neurology.org/content/20/12_Part_2/23.abstract AB