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| Effect of Perianal Blockage with Methylthioninium + Ropivacaine Admixture on Postoperative Analgesia in Patients with Circular Mixed Hemorrhoids |
| SHI Yu, NI Rui, WANG Tianci |
| First-author's address: Department of Proctology, Maanshan General Hospital of Ranger-Duree Healthcare, Maanshan 243000, China |
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