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CSF antibody levels in multiple sclerosis An Goris,* Ine Pauwels,* Marte W. Gustavsen, Brechtje van Son, Kelly Hilven, Steffan D. Bos, Elisabeth Gulowsen Celius, Pål Berg-Hansen, Jan Aarseth, Kjell-Morten Myhr, Sandra D’Alfonso, Nadia Barizzone, Maurizio A. Leone, Filippo Martinelli Boneschi, Melissa Sorosina, Giuseppe Liberatore, Ingrid Kockum, Tomas Olsson, Jan Hillert, Lars Alfredsson, Sahl Khalid Bedri, Bernhard Hemmer, Dorothea Buck, Achim Berthele, Benjamin Knier, Viola Biberacher, Vincent van Pesch, Christian Sindic, Annette Bang Oturai, Helle Bach Søndergaard, Finn Sellebjerg, Poul Erik H. Jensen, Manuel Comabella, Xavier Montalban, Jennifer Pérez-Boza, Sunny Malhotra, Jeannette Lechner-Scott, Simon Broadley, Mark Slee, Bruce Taylor, Allan G. Kermode, Pierre-Antoine Gourraud, International Multiple Sclerosis Genetics Consortium, Stephen J. Sawcer, Bettina Kullle Andreassen, Bénédicte Dubois and Hanne F. Harbo