Elevated Kappa Index in the Absence of Cerebrospinal Fluid IgG Oligoclonal Bands: Contribution of Intrathecal IgM and IgA Synthesis by Krzysztof Smolik, Roberta Bedin, Patrizia Natali, Martina Cardi, Diego Franciotta, Anna Maria Simone, Paolo Immovilli, Mario Santangelo, Matteo Gastaldi, Giulia De Napoli, Francesca Vitetta, Diana Ferraro

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