title: Certification of competence in performing specific procedures or tests in screening practice.
authors.forename: Nicholas
authors.initials: N
authors.lastname: Wald
mesh_terms: D002568:Certification; D002983:Clinical Competence; D005260:Female; D006801:Humans; D011247:Pregnancy; D011296:Prenatal Diagnosis / Q000592:standards*; D006113:United Kingdom