1. Sphingosine‐1‐Phosphate, Motor Severity, and Progression in Parkinson's Disease (MARK‐PD). Issue 9 (19th May 2021) Authors: Schwedhelm, Edzard; Englisch, Catrin; Niemann, Louisa; Lezius, Susanne; von Lucadou, Mirjam; Marmann, Kristina; Böger, Rainer; Peine, Sven; Daum, Günter; Gerloff, Christian; Choe, Chi‐un Journal: Movement disorders Issue: Volume 36:Issue 9(2021) Page Start: 2178 Record Type: Journal Article View Content: Available online (eLD content is only available in our Reading Rooms) ↗