Epidemiology of gastritis.
D000367:Age Factors; D000752:Anemia, Pernicious / Q000235:genetics; D002908:Chronic Disease; D004957:Estonia; D005387:Finland; D005756:Gastritis / Q000097:blood / Q000453:epidemiology* / Q000235:genetics / Q000473:pathology; D005757:Gastritis, Atrophic / Q000235:genetics / Q000473:pathology; D006801:Humans; D012737:Sex Factors