title: Seasonal periodicity of peptic ulcer: a myth.
authors.forename: J
authors.initials: J
authors.lastname: Negre
mesh_terms: D005260:Female; D005387:Finland; D006801:Humans; D008297:Male; D010437:Peptic Ulcer / Q000453:epidemiology*; D010507:Periodicity; D012621:Seasons; D014903:West Virginia