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Observational Study
Ami Kikuchi, Ryo Koide, Masahiro Iwasaki, Mizue Teramoto, Seiro Satohisa, Masato Tamate, Masami Horiguchi, Nozomi Niwa, Tsuyoshi Saito, Toru Mizuguchi 
World J Obstet Gynecol 8(1):1-7. Published online Nov 5, 2019. doi: 10.5317/wjog.v8.i1.1