RT Journal Article SR Electronic T1 The reproductive effects of beta interferon therapy in pregnancy: A longitudinal cohort JF Neurology JO Neurology FD Lippincott Williams & Wilkins SP 1992 OP 1992 DO 10.1212/WNL.65.12.1992 VO 65 IS 12 YR 2005 UL http://n.neurology.org/content/65/12/1992.1.abstract AB