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Ishikawa A, Otsuki S, Yamada S, Uwabe C, Imai H, Matasuda T, Takakuwa T. Formation of the periotic space during the early fetal period in humans. Anat Rec (Hoboken). 2018 Apr;301(4):563-570. doi: 10.1002/ar.23764. Epub 2018 Jan 18.