Estimating a woman's risk of having a pregnancy associated with Down's syndrome using her age and serum alpha-fetoprotein level.Cuckle, Wald, Thompson1987 MayTijdschriftartikel
Disability assessment in population surveys: results of the O.E.C.D. Common Development Effort.McWhinnie1981Tijdschriftartikel
The Tecumseh study of respiratory illness. X. Relation of acute infections to smoking, lung function and chronic symptoms.Monto, Ross1978 JanTijdschriftartikel
ASA physical status classifications: a study of consistency of ratings.Owens, Felts, Spitznagel1978 OctTijdschriftartikel