We generated the two comparison groups using simple random iz ation with an equal allocation ratio by referring to a table of random numbersA Yes ( Adequate , Low risk of bias ) B No ( Inadequate , High risk of bias ) C Unclear ( Unclear risk of bias )

We generated the two comparison groups using simple random iz ation with an equal allocation ratio by referring to a table of random numbers

A Yes ( Adequate , Low risk of bias ) 

B No ( Inadequate , High risk of bias ) 

C Unclear ( Unclear risk of bias )

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