RT Journal Article SR Electronic T1 Precious SMA natural history data JF Neurology JO Neurology FD Lippincott Williams & Wilkins SP 337 OP 339 DO 10.1212/WNL.0000000000006026 VO 91 IS 8 A1 Basil T. Darras A1 Darryl C. De Vivo YR 2018 UL http://n.neurology.org/content/91/8/337.abstract AB