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Promotional events as an effective strategy to elicit blood..:

Chandler, Torsten (10008892) ; Hiller, Jens (10008895) ; Peine, Sven (10008898).
https://figshare.com/articles/dataset/Promotional_events_as_an_effective_strategy_to_elicit_blood_donations_an_evaluation_of_cost_and_benefit/13613791.  , 2020