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2. Placental polyp: report of 3 cases;Hoberman;Obstet Gynecol,1963
3. Retained products of conception: histologic viability of placental polyps;Swan;Obstet Gynecol,1969
4. Placental polyp with prominent neovascularization;Takeda;Fertil Steril,2010
5. A case of placental polyp developed immediately after spontaneous abortion;Kaneko;Nippon Sanka Fujinka Gakkai Zasshi,1992