Kappa free light chains is a valid tool in the diagnostics of MS : A large multicenter study - Leurs, C. E. (VU University Medical Center. Department of Neurology) ; Twaalfhoven, Ham (Neurochemistry Laboratory and Biobank, Department of Clinical Chemistry) ; Lissenberg-Witte, B. I. (Department of Epidemiology and Biostatistics, Amsterdam UMC) ; van Pesch, V (Department of Neurology, Cliniques Universitaires Saint-Luc, Université Catholique de Louvain) ; Dujmovic, Irena (Clinic of Neurology, Clinical Centre of Serbia, School of Medicine, University of Belgrade) ; Drulovic, Jelena (Clinic of Neurology, Clinical Centre of Serbia, School of Medicine, University of Belgrade) ; Castellazzi, M. (Department of Biomedical and Specialty Surgical Sciences, University of Ferrara) ; Bellini, T. (Department of Biomedical and Specialty Surgical Sciences, University of Ferrara) ; Pugliatti, M. (Department of Biomedical and Specialty Surgical Sciences, University of Ferrara) ; Kuhle, Jens (Neurologic Clinic and Policlinic, Departments of Medicine, Clinical Research and Biomedicine, University Hospital Basel) ; Villar, L. M. (Hospital Universitario Ramón y Cajal (Madrid)) ; Alvarez-Cermeño, José C (Hospital Ramón y Cajal. Departamento de Neurologia) ; Alvarez-Lafuente, Roberto (Instituto de Investigación Sanitaria San Carlos) ; Hegen, Harald (Department of Neurology, Medical University of Innsbruck) ; Deisenhammer, Florian (Department of Neurology, Medical University of Innsbruck) ; Walchhofer, L. M. (Department of Neurology, Medical University of Innsbruck) ; Thouvenot, Eric (Hôpital Caremeau, Nîmes. Departement of Neurology) ; Comabella, Manuel (Hospital Universitari Vall d'Hebron) ; Montalban, Xavier (Hospital Universitari Vall d'Hebron) ; Vécsei, L. (Department of Neurology, University of Szeged) ; Rajda, C. (Department of Neurology, University of Szeged) ; Galimberti, Daniela (Multiple Sclerosis Centre, University of Milan) ; Scarpini, E. (Multiple Sclerosis Centre, University of Milan) ; Altintas, Ayse (Koc University, School of Medicine, Neurology Department) ; Rejdak, K. (Department of Neurology, Medical University of Lublin) ; Frederiksen, J. L. (Department of Neurology, Rigshospitalet Glostrup and University of Copenhagen) ; Pihl-Jensen, G. (Department of Neurology, Rigshospitalet Glostrup and University of Copenhagen) ; Jensen, Peh (Danish Multiple Sclerosis Centre, Department of Neurology, Rigshospitalet, University of Copenhagen) ; Khalil, Michael (Department of Neurology, Medical University of Graz) ; Voortman, Margarete (Department of Neurology, Medical University of Graz) ; Fazekas, F. (Department of Neurology, Medical University of Graz) ; Saiz, Albert (Institut d'Investigacions Biomèdiques August Pi i Sunyer) ; La Puma, D. (Institut d'Investigacions Biomèdiques August Pi i Sunyer) ; Vercammen, M. (Department of Laboratory Medicine, AZ Sint-Jan Brugge-Oostende) ; Vanopdenbosch, L. (Department of Neurology, AZ Sint-Jan Brugge-Oostende) ; Uitdehaag, BMJ (Department of Neurology, MS Center Amsterdam, Amsterdam Neuroscience, Amsterdam UMC) ; Killestein, Joep (Department of Neurology, MS Center Amsterdam, Amsterdam Neuroscience, Amsterdam UMC) ; Bridel, C. (Neurochemistry Laboratory and Biobank, Department of Clinical Chemistry) ; Teunissen, Charlotte E. (Neurochemistry Laboratory and Biobank, Department of Clinical Chemistry) ; Universitat Autònoma de Barcelona. Departament de Medicina