Intravenous immunoglobulin and intravenous methylprednisolone as optimal induction treatment in chronic inflammatory demyelinating polyradiculoneuropathy: protocol of an internatio... oleh S. R. M. Bus, L. Zambreanu, A. Abbas, Y. A. Rajabally, R. D. M. Hadden, R. J. de Haan, C. A. J. M. de Borgie, M. P. Lunn, I. N. van Schaik, F. Eftimov, on behalf of the OPTIC study group