The subjects will be randomly divided into two groups of intervention and control group, each group will be 20 patiennts. The subjects were randomly divided into two groups of intervention and control. Letter A is assigned to the samples of intervention group and letter B to the samples of the control group, In this method, six modes of AABB, BBAA, BABA, ABBA, BAAB and ABAB are written in separate worksheets and placed inside a container. Then go to
Randomly take one of the sheets out of the container, assuming ABAB. We put the first patients in Group A, the second in Group B, the third in Group A, and the fourth in Group B, and this leaf. And that's why, based on these six modes, 24 patients are selected and entered into groups. We repeat this method until 40 patients are selected. Since the sample size in this study is 40 patients, this operation is repeated twice.