Manuel Raab1, Emmanuelle Roth2, Vinh-Kim Nguyen3, Guenter Froeschl1. 1. Division of Infectious Diseases and Tropical Medicine, University Hospital (LMU), Munich, Germany. 2. Department of Social Anthropology, Cambridge University, Cambridge, United Kingdom. 3. Department of Anthropology and Sociology, The Graduate Institute (IHEID), Geneva, Switzerland.