title: Level 1, level 2, level 3 obstetric sonography: I'll see your level and raise you one.
authors.forename: R A
authors.initials: RA
authors.lastname: Filly
mesh_terms: D005260:Female; D005315:Fetal Diseases / Q000175:diagnosis*; D006300:Health Services Misuse; D006801:Humans; D011247:Pregnancy; D011296:Prenatal Diagnosis; D014463:Ultrasonography