title: Urinary calculi.
mesh_terms: D001741:Black or African American; D044383:Black People; D002118:Calcium / Q000032:analysis; D005006:Ethnicity; D006801:Humans; D010710:Phosphates / Q000032:analysis; D013019:South Africa; D014545:Urinary Calculi / Q000453:epidemiology / Q000378:metabolism*
chemical_list: D010710:Phosphates; D002118:Calcium