1. Institute of Primary Health Care (BIHAM), University of Bern, Bern, Switzerland.
2. Department of Psychiatry, Neurology, Epidemiology and Biostatistics, University of California, San Francisco, California, USA.
3. Department of Internal Medicine and Cognitive Health Services Research Program, University of Michigan, Ann Arbor, Michigan, USA.
4. Department of Cardiology, Kaiser Permanente Northern California, Oakland, California, USA.
5. Division of Research, Kaiser Permanente Northern California, Oakland, California, USA.
6. University General Medicine and Public Health Centre, University of Lausanne, Lausanne, Switzerland.
7. Department of Paediatrics, University Hospital Bern, Inselspital, Bern, Switzerland.