RT Journal Article SR Electronic T1 Comment: Altered sphingolipid metabolism—A marker for episodic migraine? JF Neurology JO Neurology FD Lippincott Williams & Wilkins SP 1222 OP 1222 DO 10.1212/WNL.0000000000002007 VO 85 IS 14 A1 Karl Ekbom YR 2015 UL http://n.neurology.org/content/85/14/1222.abstract AB