ABO groups and Rh genotypes in the elderly.
D000017:ABO Blood-Group System; D000368:Aged; D000369:Aged, 80 and over; D001789:Blood Group Antigens; D005838:Genotype; D006801:Humans
D000017:ABO Blood-Group System; D001789:Blood Group Antigens
BLOOD GROUPS/in old age