“…In their review, Godin et al ( 2012 ) classified non-incentive interventions into four types: social interventions that manipulate altruism and egoism, reminders, foot-in-the-door or door-in-the-face techniques, and intention activation. Most of these interventions are implemented through the provision of social information, including descriptions of social impact (Moussaoui et al, 2019 ; Goette and Tripodi, 2020 ); comparisons with social norms (Xie et al, 2019 ); modeling (Rushton and Campbell, 1977 ); descriptions of a current blood shortage (Sun et al, 2016 , 2019 ); registry invitations (Heger et al, 2020 ); or questionnaires asking donors to specify their donation intention to activate cognitions about blood donation (Stutzer et al, 2011 ). However, evidence related to the efficacy of these information interventions is mixed.…”