[Endoscopic and biopsy studies on chronic gastritis. 1. Atrophic gastritis].
D000328:Adult; D000367:Age Factors; D001706:Biopsy; D002908:Chronic Disease; D005336:Fiber Optic Technology; D005750:Gastric Juice / Q000378:metabolism; D005756:Gastritis / Q000473:pathology*; D005773:Gastroscopy; D006801:Humans; D008875:Middle Aged