By the way, doctor. I'm 77 and in good health. I believe I'm particularly welcome at the blood bank because I have O-negative blood. I give blood several times a year. At my age, how frequently is it wise to give?
Komaroff
Anthony L
AL
D000367:Age Factors; D000368:Aged; D001782:Blood Donors; D006801:Humans; D012449:Safety