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    Ratpaporn Piyawetchakarn et al, 2019, Journal of Obstetrics and Gynaecology Research CrossRef
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    Luu Doan Ireland et al, 2016, Obstetrical & Gynecological Survey CrossRef
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    Kittipat Charoenkwan et al, 2020, Journal of Obstetrics and Gynaecology Research CrossRef