Altruism can have its rewards.
Keating
J
J
D000293:Adolescent; D000740:Anemia / Q000175:diagnosis* / Q000209:etiology; D001782:Blood Donors; D005767:Gastrointestinal Diseases / Q000150:complications / Q000175:diagnosis*; D006801:Humans; D008297:Male; D008875:Middle Aged