1. Geriatric Medicine Department of Internal Medicine and Clinical NutritionSahlgrenska Academy Institute of Medicine University of Gothenburg Gothenburg Sweden
2. Centre for Bone and Arthritis Research Sahlgrenska Academy Institute of Medicine University of GothenburgGothenburg Sweden
3. Department of Mathematical Sciences Chalmers University of Technology Gothenburg Sweden
4. Institute for Health and Ageing Catholic University of Australia Melbourne Victoria Australia