RT Journal Article SR Electronic T1 Apathy does not equal depression in Parkinson disease JF Neurology JO Neurology FD Lippincott Williams & Wilkins SP 10 OP 11 DO 10.1212/01.wnl.0000231141.03382.92 VO 67 IS 1 A1 Richard, Irene Hegeman YR 2006 UL http://n.neurology.org/content/67/1/10.abstract AB