参考
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Sleisenger and Fordtran's Gastrointestinal and Liver Disease (10 ed.). Saunders. 2016. pp. 130–147.
Emergency Medicine (2 ed.). Saunders. 2013. pp. 1660–1663.
Kumar and Clark's Clinical Medicine (9 ed.). Elsevier. 2017. pp. 31–42.
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Essentials of Radiology (3 ed.). Saunders. 2014. pp. 115–156.