title: The use of obstetric ultrasonography: the first 1,000 examinations at Ramathibodi Hospital.
mesh_terms: D000293:Adolescent; D000328:Adult; D005260:Female; D006785:Hospitals, University; D006801:Humans; D008875:Middle Aged; D011247:Pregnancy; D011296:Prenatal Diagnosis / Q000706:statistics & numerical data*; D012189:Retrospective Studies; D013785:Thailand; D014463:Ultrasonography / Q000706:statistics & numerical data*