title: Letter: SMON.
mesh_terms: D000005:Abdomen; D004196:Disease Outbreaks / Q000453:epidemiology; D006801:Humans; D007564:Japan; D009187:Myelitis / Q000453:epidemiology*; D009902:Optic Neuritis / Q000453:epidemiology*; D010146:Pain / Q000453:epidemiology