RT Journal Article SR Electronic T1 Letter re: Evaluating the safety of β-interferons in MS: A series of nested case-control studies JF Neurology JO Neurology FD Lippincott Williams & Wilkins SP 2022 OP 2022 DO 10.1212/WNL.0000000000004620 VO 89 IS 19 A1 Jongen, Peter J. YR 2017 UL http://n.neurology.org/content/89/19/2022.2.abstract AB