1. Center for Empirical Research in Economics and Behavioural Science (CEREB), University of Erfurt, 99089 Erfurt, Germany
2. Psychology and Infectious Disease Lab (PIDI), University of Erfurt, 99089 Erfurt, Germany
3. Media and Communication Science, University of Erfurt, 99089 Erfurt, Germany
4. Agence de Médecine Préventive (AMP) Afrique, Abidjan 08 BP 660, Côte d’Ivoire
5. National Immunization Technical Advisory Groups (NITAGs), Ouaga 06, Ouagadougou 06 BP 9096, Burkina Faso
6. Ministry of Health, S.L.P. 743, Dar es Salaam P.O. Box 9083, Tanzania
7. Executive Secretary, National Primary Healthcare Development Agency (NPHCDA), Area 11, Abuja P.O. Box 123, Nigeria