title: [Diagnosis of early pregnancy--a new progress].
authors.forename: D S
authors.initials: DS
authors.lastname: Yang
mesh_terms: D001208:Asia; D002681:China; D009358:Congenital, Hereditary, and Neonatal Diseases and Abnormalities; D003906:Developing Countries; D003933:Diagnosis; D004194:Disease; D005202:Asia, Eastern; D011247:Pregnancy; D012098:Reproduction
keywords: Asia; China; Developing Countries; Diseases; Eastern Asia; Examinations And Diagnoses; Neonatal Diseases And Abnormalities; Pregnancy; Reproduction