Citation: 庞勇, 张炳印, 田伏洲, 白文涛, 刘丹青, 黄尚卿. The Application of Four Progressive Steps in The Teaching of Difficult Cannulation in ERCP. CHINESE JOURNAL OF BASES AND CLINICS IN GENERAL SURGERY, 2014, 21(6): 769-770. doi: 10.7507/1007-9424.20140183 Copy
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