Question: Q3: Since this study was designed as a hypothesis testing study, the power of test was predetermined, so was the minimum sample size to achieve

Q3: Since this study was designed as a hypothesis testing study, the power of test was predetermined, so was the minimum sample size to achieve this power. How was the sample size determined in this article? You should provide not only the procedure name but also the details on how to get the sample size (i.e. provide your calculation to confirm their results. This calculation should be not complicated]

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