1. Research Group on Health Marketing, Institute for Marketing University of Hamburg Hamburg Germany
2. Department of Donor Medicine Research, Research Group on Donor Studies Sanquin Research Amsterdam The Netherlands
3. Faculty of Social Sciences Vrije Universiteit Amsterdam Amsterdam The Netherlands
4. University of Groningen Groningen The Netherlands
5. Etablissement Français du Sang Rennes France
6. Institute of Law and Political Science University of Rennes Rennes France
7. Laboratory of Psychology: Cognition, Behavior, Communication University of Rennes 2 Rennes France
8. Etablissement Français du Sang Besançon France
9. DRK‐Blood Service Baden‐Wuerttemberg‐Hessen Mannheim Germany
10. Centro Nazionale Sangue Istituto Superiore di Sanità Rome Italy