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| Value of Hydromorphone Combined with Bupivacaine on Patient-controlled Epidural Analgesia after Cesarean Section |
| ZHOU Pan, LIU Jianbo, YANG Jiewen |
| First-author's address: Department of Anesthesiology, Maternity & Child Care Center of Xinyu, Xinyu 338000, China |
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Received: 22 December 2023
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