Uric acid, uric acid dihydrate, and ammnoniumn acid urate occur in bladder stones both ancient and modern. They are seldomn abuindant in stones fromn technically developed areas. Urates are usually confined to children's endemic bladder stones; uric acid dihydrate is rare, but uric acid used to be commzinon in bladder stones from elderly men.
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Lonsdale et al. (1966) studied this question.
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