RT Journal Article SR Electronic T1 Relationship of UV exposure to prevalence of multiple sclerosis in England JF Neurology JO Neurology FD Lippincott Williams & Wilkins SP 1773 OP 1773 DO 10.1212/WNL.0b013e3182214c44 VO 76 IS 20 YR 2011 UL http://n.neurology.org/content/76/20/1773.abstract AB