1. Department of Behavioural Ecology, Institute of Ecology and Evolution, University of Bern, Wohlenstr 50a,
3032 Hinterkappelen, Switzerland
2. Division of International and Environmental Health, Institute of Social and Preventive Medicine (ISPM), University of Bern, Finkenhubelweg 11, 3012 Bern, Switzerland
3. Clinical Trials Unit Bern, Department of Clinical Research, University of Bern, Finkenhubelweg 11, 3012 Bern, Switzerland