罗哌卡因复合不同剂量舒芬太尼骶管阻滞对肛肠手术后镇痛效果的影响
라고잡인복합불동제량서분태니저관조체대항장수술후진통효과적영향
Evaluate of ropivacaine combined with different doses of sufentanil using in caudal block on postoperative pain for anorectal operation
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