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The analysis is based on intention. Based on the calculation of sample size, check the influence of cordclamp. Within eight months of a country's memory impairment is found at 70.19 within eight months in a different percentage from 70% to 55% 41 * in the gap between the processing group and 80% s power and 0.05 type I error, a small error is required in each group. After allowing 35% attraction, we decided to allocate 270 in each processing group.<br>
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