1. Institute of Social Anthropology, University of Bern, Lerchenweg 36, 3000 Bern 9, Switzerland
2. Institute of Social Anthropology,
University of Bern,
Lerchenweg 36,
3000 Bern 9,
Switzerland
3. Health Department, Applied Research & Development in Nursing, Bern University of Applied Sciences, Murtenstrasse 10, 3008 Bern, Switzerland
4. Swiss Research Institute for Public Health and Addiction, University of Zurich, Konradstrasse 32, 8005 Zürich, Switzerland