按需镇痛与按时镇痛在骨科无痛病房建设中的临床应用效果比较
안수진통여안시진통재골과무통병방건설중적림상응용효과비교
Peri-operative analgesia effect between pain relief on timing method and pain relief on required method in orthopaedic "painless unit" procedures
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