oper TCM diagnosis of the zheng of the patientР? Correct selection of the corresponding therapeutic strategies and principles that guide the choice of herbs and herbal formulasРDigression from either of the above guidence will lead to misuses of herbs, andРwill result in complications in patientРР• Randomized controlled trialsРAdvantages:Р? Elimination of the potential bias in the allocation of participants to the intervention group or control groupР? Tendency to produce comparable groupsР? Guaranteed validity of statistical tests of significanceРLimitations:Р? Difficulty in generalizing the results obtained from the selected sampling to the population as a wholeР? A poor choice for research where temporal factors are anРissueР? Extremely heavy resources, requiring very large sampleРgroups
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