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13. Trends in ectopic pregnancies: United States 1970 to 1985. Stat Bull Metrop Insur Co; 1987; 68(3):24-30. PubMed ID: 3660218 [No Abstract] [Full Text] [Related]
14. From the Centers for Disease Control and Prevention. Ectopic pregnancy--United States, 1990-1992. JAMA; 1995 Feb; 273(7):533. PubMed ID: 7837386 [No Abstract] [Full Text] [Related]