Enriched enrollment randomized double-blind placebo-controlled cross-over trial with phenytoin cream in painful chronic idiopathic axonal polyneuropathy (EPHENE): a study protocol by David J. Kopsky, Ruben P. A. van Eijk, Janna K. Warendorf, Jan M. Keppel Hesselink, Nicolette C. Notermans, Alexander F. J. E. Vrancken

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