1. a Department of Work and Social Psychology, Faculty of Psychology and Neuroscience , Maastricht University , PO Box 616, 6200 , MD , Maastricht , the Netherlands
2. b STI AIDS the Netherlands , Amsterdam , the Netherlands
3. c Department of Psychology , Illinois State University , Normal , IL , USA
4. d Communication Science , Wageningen University , Wageningen , the Netherlands
5. e Department of Internal Medicine, Division of Infectious Diseases, Tropical Medicine and AIDS, and Centre for Infection and Immunity Amsterdam (CINIMA), Academic Medical Centre , University of Amsterdam , Amsterdam , the Netherlands