African subjects were from Nigeria (49%), Liberia (8%), Algeria (8%), Sudan (7%), Uganda (5%), Cameroon (3%), Ghana, Kenya, Tanzania, Angola, Somalia, Guinea (each 1.5%), and 9% from unspecified African countries. Overall, 61% of African cohort was from West Africa, 10% from East Africa, 15% from North Africa, 2% from Southern Africa, and 3% from Central Africa.