this cross-sectional study was conducted among pregnant and postpartum women in rural areas of Sichuan Province, Southwest China, from December, 2017 to May, 2018.
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A multi-stage stratified random sampling was used to acquire the sample. In the first stage, we randomly chose a city in Sichuan province. In the second stage, we randomly selected a rural district in the city. In the third stage, 10 townships were randomly selected from the rural district. In the fourth stage, we randomly selected 50 maternal women from the database of maternal women established by each township hospital. 498 participants out of a total of 500 participants in these townships returned questionnaires (a response rate of 99.6%). Questionnaires were checked after the interviews for completeness. Eight records met exclusion criteria (Incomplete data collection: n=2; postpartum period>6 months n=6). Overall, 490 questionnaires were valid.