RT Journal Article SR Electronic T1 Methodology of the Study of Ageing JF Neurology JO Neurology FD Lippincott Williams & Wilkins SP 86 OP 86 DO 10.1212/WNL.8.1.86 VO 8 IS 1 YR 1958 UL http://n.neurology.org/content/8/1/86.1.abstract AB