Sampling methods
Among 87 pregnant women evaluated by the researcher, 35 women have been excluded from the study for the following reasons: Not meeting inclusion criteria (n = 14), Declining to participate (n = 18), or Other reasons (n = 3). Finally, 52 women met the eligible criteria and were allocated to intervention (n = 26) and control (n = 26) groups using a four-block randomization method. First, all the four-block modes of the intervention (A) and control (B) groups were determined and the random allocation sequence was selected from a random numbers Table (13 blocks). The 52 envelopes were numbered and arranged in the same sequence and each letter of this sequence was placed in them. An envelope was opened to determine the assignment of an individual to either the control or intervention group, and the person was subsequently allocated to the designated group. The order and sequence of allocation were done by the research supervisor (RKh) and the participants were registered and enrolled by the research colleagues, and the participants were assigned to each group by the researcher (FV). See Fig. 
Consort Flow Diagram