Sample size estimation
Based on the results of our pre-experiment (10 participants in each group), the incidence of PPD at 6 weeks after delivery can be reduced by 12% in the tested group. Power analysis showed that a reduction rate of 15% with 
CONSORT flow diagram. In the study, a total of 120 participants were enrolled initially and three participants were excluded during the trial. Finally, There were 117 participants included in the statistical analysis (58 in Group E and 59 in Group C, respectively). CONSORT: the Consolidated Standards of Reporting Trials