title: Gravel passers.
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000493:Allopurinol / Q000627:therapeutic use; D003131:Combined Modality Therapy; D005260:Female; D005440:Fluid Therapy; D006801:Humans; D008297:Male; D008875:Middle Aged; D012189:Retrospective Studies; D014527:Uric Acid / Q000378:metabolism*; D014545:Urinary Calculi / Q000378:metabolism
chemical_list: D014527:Uric Acid; D000493:Allopurinol