title: Normal early pregnancy: serum hCG levels and vaginal ultrasonography findings.
authors.forename: N F
authors.initials: NF
authors.lastname: Perks
authors.forename: E A
authors.initials: EA
authors.lastname: Sherriff
authors.forename: R M
authors.initials: RM
authors.lastname: Winston
mesh_terms: D005260:Female; D005307:Fertilization in Vitro; D005865:Gestational Age; D006801:Humans; D011247:Pregnancy; D016216:Ultrasonography, Prenatal