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| Effect of Suction Ureteral Access Sheath Combined with Retrograde Intrarenal Surgery in the Treatment of Patients with 2-3 cm Upper Urinary Tract Calculi |
| WU Shi, YAO Hao, ZHU Congwu, LI Min |
| First-author's address: Department of Urology, Yangzhou Hongquan Hospital, Yangzhou 225200, China |
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