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| The Role of the Introducer Sheath in the Treatment of Embedded Stones in the Upper and Middle Ureter by Flexible Ureteroscopy |
| LUO Qinghua, CAO Leihua, TU Hongjian |
| First-author's address: Department of Urology, the Third Hospital of Nanchang, Nanchang 330009, China |
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Received: 11 January 2024
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