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blood self-esteem donor study intention donation intervention health information blood donation helpline attitude ficacy caller measure model behaviour recruitment program self-ef ficacy self-ef effect theory affective psychology research people testing evaluation altruism children education affective attitude telephone result adolescent variance factor university respondent behavior society motivation society reproduction blood donors variable counseling dutch netherland question student signi journal belief self-esteem interventions sample vct-participation blood donation intentions population friend blood bank british family experience level hotline regression lemmen prevention hiv testing internet donor recruitment review antecedent fi ndings participant ficant conner blood donor change
