Method:double blind and double simulated comparison tests to compare pain relieving effects and side effects in treating 121 cases of severe tumor pain by Guiseng Zhitong Mixture and Qiangtongding.
方法：随机、双盲、双模拟对照试验，比较桂参止痛合剂、强痛定对12 1例中、重度癌痛的镇痛效果及不良反应。
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