1. Department of Nursing Sciences, School of Health Sciences, HES-SO Valais/Wallis, University of Applied Sciences and Arts Western Switzerland, CH-1950 Sion, Switzerland
2. Institute of Health Sciences, Universidade Católica Portuguesa, 4169-005 Porto, Portugal
3. Geospatial Molecular Epidemiology Group (GEOME), Laboratory for Biological Geochemistry (LGB), Ecole Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland
4. Service of Old Age Psychiatry, Department of Psychiatry, Lausanne University Hospital, CH-1008 Lausanne, Switzerland