("world blood donor day" or mh:"doadores de sangue/psicologia") or (("doadores de sangue" or "doacao de sangue" or "Doador de sangue" or "Blood Donation" or "Blood Donations" or "Blood donor" or "blood donors" or "Donadores de Sangre" or "Donante de sangre") (mh:motivacao or mh:altruism$ or mh:"saude global" or mh:"Conhecimentos, Atitudes e Prática em Saúde" or mh:"Atitude Frente à Saúde" or mh:"saude global" or ((save$ or saving or salva$) (life or lives or vida$)) or ti:altruism$ or ti:motiva$ or ti:behavior or ti:comportament$))
Databases
MEDLINE, LILACS, CDSR - Cochrane Systematic Reviews Database, CENTRAL Controlled Clinical Trials : CENTRAL Controlled Clinical Trials, DARE - Database of Abstracts of Review of Effects, NHS Economic Evaluations Database, HTA - Health Technology Assessment Database, WHOLIS (WHO Library Database), PAHO (PAHO Library Database), All VHL databases.