title: A flawed challenge but valid recommendation: a response to Takoudes and Hamar.
authors.affiliation: Department of Pathology and Laboratory Medicine, Women & Infants Hospital/Alpert Medical School at Brown University, Providence, RI, USA.
authors.forename: G E
authors.initials: GE
authors.lastname: Palomaki
authors.forename: E R
authors.initials: ER
authors.lastname: Ashwood
authors.forename: K E
authors.initials: KE
authors.lastname: Weck
mesh_terms: D005260:Female; D006801:Humans; D062145:Maternal Serum Screening Tests; D011247:Pregnancy; D011296:Prenatal Diagnosis / Q000592:standards*