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<h2 id="references">References</h2> <ol> <li id="fn:1"><p>Butt, Arthur J. (1956). Etiologic Factors in Renal Lithiasis. Thomas. ISBN 9780398043742. {{cite book}}: ISBN / Date incompatibility (help) <a href="9780398043742" target="_blank">9780398043742</a> <a href="#fnref:1" class="footnote-back-ref">↩</a></p></li> <li id="fn:2"><p>Butt, Arthur J. (1956). Etiologic Factors in Renal Lithiasis. Thomas. ISBN 9780398043742. {{cite book}}: ISBN / Date incompatibility (help) <a href="9780398043742" target="_blank">9780398043742</a> <a href="#fnref:2" class="footnote-back-ref">↩</a></p></li> </ol>