In this study, Random allocation is done by randomize blocking method. In this method, in order to be able to compare individuals and maintain equilibrium of the samples in groups, by randomize blocking method, participants in the study are divide into two equal groups. Block sizes are also randomly select (block 2, 4, 8), which In each block there are equal numbers of participants in each group. For example, in a 4-d piece block, 2 blocks belong to the intervention group and 2 blocks belong to the control group. Or in a 8-d piece block, 4 blocks belong to the intervention group and 4 blocks belong to the control group. Blocks are also randomly select to prevent disclosure of the last allocation in each block. For example, the select block is a 4-d piece, Which for each person to study is take a tab from inside the 4-d piece block and accidentally assign to one of the intervention or control groups and this process continues until the tabs in the block are complete. Again, the 4-d piece block is return to the drawer desk and to select the group of other participants, a block is randomly select from among the remaining blocks, which may be 8-d piece block, 4-d piece block, and this process continues until the sample size is complete.