title: Natural history of peptic ulcer in Poland. Part I. Abdominal pains.
authors.forename: E
authors.initials: E
authors.lastname: Ruzyłło
authors.forename: J
authors.initials: J
authors.lastname: Ruszkowski
mesh_terms: D000005:Abdomen; D005260:Female; D006801:Humans; D007256:Information Systems; D008297:Male; D008487:Medical History Taking; D010146:Pain / Q000503:physiopathology*; D010437:Peptic Ulcer / Q000453:epidemiology / Q000503:physiopathology*; D011044:Poland