title: [Preface].
authors.forename: Hiroki
authors.initials: H
authors.lastname: Takada
authors.forename: Masaru
authors.initials: M
authors.lastname: Miyao
mesh_terms: D000367:Age Factors; D004415:Dyspepsia / Q000175:diagnosis* / Q000453:epidemiology* / Q000503:physiopathology; D004568:Electrodiagnosis / Q000379:methods; D006801:Humans; D007564:Japan