Methods: Randomized, double-blind and drug parallel comparison trial were adopted.
方法：采用随机、双盲、平行对照试验。
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。
Methods Multi-center randomized double-blind trial with positive control and split-mouth comparison was designed.
方法多中心随机、双盲、阳性药物对照、左右半口对照设计。
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