The Montreal Pregnancy Study: an investigation of very early pregnancies.
D000022:Abortion, Spontaneous / Q000652:urine*; D000328:Adult; D006063:Chorionic Gonadotropin / Q000652:urine*; D005260:Female; D006801:Humans; D011247:Pregnancy; D011259:Pregnancy Tests, Immunologic / Q000379:methods*; D011863:Radioimmunoassay
D006063:Chorionic Gonadotropin