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The future demographic changes will be associated with an enhancement of the worldwide shortage of blood. The aging of the population in developed countries is associated with a decrease of young individuals being potentially eligible to donate blood and an increase of older individuals which might be in the need of blood transfusion. Therefore, the retention of active blood donors (BD) is becoming more important. A substantial increase in blood donations could be achieved by Ódoi:10.1111/j.1423-0410.2010.01343_1.x pmid:20591082 fatcat:tup6xpf3m5eblgwg56fg4pmudq