European Federation of Neurological Societies/Peripheral Nerve Society guideline on management of chronic inflammatory demyelinating polyradiculoneuropathy: report of a joint task force of the European Federation of Neurological Societies and the Peripheral Nerve Society - first revision - Van den Bergh, P YK; Hadden, R DM; Bouche, P; European Federation of Neurological Societies; Peripheral Nerve Society (Eur J Neurol, 2010)