1. Health Psychology, Institute of Applied Health Sciences, University of Aberdeen, Aberdeen, UK
2. Department of Psychology, University of Edinburgh, Edinburgh, UK
3. Kilimanjaro Clinical Research Institute/Kilimanjaro Christian Medical Center, Moshi, Tanzania
4. University College Maastricht, Maastricht University, Maastricht, The Netherlands
5. Department of Internal Medicine, Radboud University Nijmegen Medical Center, Nijmegen, The Netherlands