1. Division of Bone Diseases, Department of Internal Medicine Specialties, Geneva University Hospitals & Faculty of Medicine, Geneva, Switzerland
2. Geriatric Clinic, University Hospital Zurich, Zurich, Switzerland
3. Centre on Aging & Mobility, University of Zurich, Switzerland
4. City Hospital Waid, Zurich, Switzerland
5. Bone Metabolism Laboratory, Jean Meyer USDA Human Nutrition Research Center on Aging at Tufts University, Boston, MA 02111, USA
6. Department of Nutrition Science, Purdue University, West Lafayette, IN 47907, USA