Factors associated with depressive mood at the onset of multiple sclerosis - an analysis of 781 patients of the German NationMS cohort oleh Anke Salmen, Robert Hoepner, Vinzenz Fleischer, Milena Heldt, Barbara Gisevius, Jeremias Motte, Klemens Ruprecht, Ruth Schneider, Anna Lena Fisse, Thomas Grüter, Carsten Lukas, Achim Berthele, Katrin Giglhuber, Martina Flaskamp, Mark Mühlau, Jan Kirschke, Stefan Bittner, Sergiu Groppa, Felix Lüssi, Antonios Bayas, Sven Meuth, Cristoph Heesen, Corinna Trebst, Brigitte Wildemann, Florian Then Bergh, Gisela Antony, Tania Kümpfel, Friedemann Paul, Sandra Nischwitz, Hayrettin Tumani, Uwe Zettl, Bernhard Hemmer, Heinz Wiendl, Frauke Zipp, Ralf Gold