| Evidence classification method： |
Delphi Grade Standard
Recommended Level
A Supported by at least 2 GradeⅠresearch results
B Only supported by one GradeⅠresearch result
C Only supported by GradeⅡresearch results
D Supported by at least one Grade III research result
E Only supported by Grade IV or V research results
Research Classification
Ⅰ Large sample size, randomized study, clear results, low false positive or false negative errors
Ⅱ Small sample size, randomized study, inconclusive results, high false positive and/or false negative errors
Ⅲ non-randomized, concurrent controlled study
IV Nonrandomized, historical controls and expert opinion
Ⅴ Case report, uncontrolled study and expert opinion
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