方法：选取符合标准的研究对象117例，按照住院号单双号进行分组。
Methods:The study found 117 cases of the standard, according to number odd and even hospital numbers to group.
所有病例按照其住院号末位数的奇偶数随机分为对照组及实验组，每组20例。
The patients were divided into experimental group and control group randomly according to the odevity of the last number of the ID number, and each group has 20 cases.
对选定的121例研究对象按住院流水号随机分为对照组（56例）和强化组（65例）。
Methods To divided 121 selected objections into control group (56) and strength group (65) according the in-patient flow number.
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