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Distribution of papillary surface Randall's plaque coverage among controls and idiopathic calcium oxalate stone-formers (ICSFs). (A) Randall's plaque coverage was not related to the age of ICSFs (closed circles) or controls (open circles). (B) Nine of 10 controls had <5% plaque coverage (median, 0.9%). (C) The ICSF group appears to contain a group of persons with higher amounts of plaque (≥5%).
