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24. Frequency of implantation and early pregnancy loss in natural cycles. Chard T Baillieres Clin Obstet Gynaecol; 1991 Mar; 5(1):179-89. PubMed ID: 1855339 [No Abstract] [Full Text] [Related]
25. Physical activity before you know you are pregnant. Hatch M Epidemiology; 2000 Jan; 11(1):4-5. PubMed ID: 10615835 [No Abstract] [Full Text] [Related]
26. Serum levels of pregnancy-specific beta 1-glycoprotein (SP1) and human chorionic gonadotropin (beta-hCG) in women using an intrauterine device. Tamsen L; Eneroth P Contraception; 1986 May; 33(5):497-501. PubMed ID: 2428559 [TBL] [Abstract][Full Text] [Related]
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28. [Human chorionic gonadotropin and its subunits in normal and pathologic pregnancies]. Gaspard U; Foidart JM; Lambotte R; Reuter AM; Franchimont P Ann Endocrinol (Paris); 1984; 45(4-5):269-80. PubMed ID: 6085538 [TBL] [Abstract][Full Text] [Related]
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30. Placental proteins in the diagnosis and evaluation of the "elusive" early pregnancy. Sinosich MJ; Grudzinskas JG; Saunders DM Obstet Gynecol Surv; 1985 May; 40(5):273-82. PubMed ID: 3889743 [TBL] [Abstract][Full Text] [Related]