title: [Clinical investigation of serum group I pepsinogen (PG I) by radioimmunoassay].
mesh_terms: D000328:Adult; D004381:Duodenal Ulcer / Q000201:enzymology; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D010435:Pepsinogens / Q000097:blood*; D011863:Radioimmunoassay; D011933:Reagent Kits, Diagnostic; D013276:Stomach Ulcer / Q000201:enzymology
chemical_list: D010435:Pepsinogens; D011933:Reagent Kits, Diagnostic