Down syndrome in the black population.
Kromberg
J G
JG
Christianson
A L
AL
Duthie-Nurse
G
G
Zwane
E
E
Jenkins
T
T
D044383:Black People; D004314:Down Syndrome / Q000453:epidemiology*; D006801:Humans; D011446:Prospective Studies; D013019:South Africa / Q000453:epidemiology