Cross-sectional analysis reflects chronology of disease. A study of antral sparing in type A gastritis.
D000752:Anemia, Pernicious / Q000235:genetics*; D005756:Gastritis / Q000175:diagnosis* / Q000235:genetics*; D005757:Gastritis, Atrophic / Q000175:diagnosis* / Q000235:genetics*; D006801:Humans