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8. Ectopic pregnancy. An eight-year review. Helvacioglu A, Long EM, Yang SL. J Reprod Med; 1979 Feb; 22(2):87-92. PubMed ID: 439084 [Abstract] [Full Text] [Related]
11. The rise in ectopic pregnancy--exploration of possible reasons. Chavkin W. Int J Gynaecol Obstet; 1982 Aug; 20(4):341-50. PubMed ID: 6127270 [Abstract] [Full Text] [Related]