1. Department of Orthopedic Surgery; Center for Bone Quality; Leiden University Medical Center; Leiden The Netherlands
2. Section on Skeletal Disorders and Mineral Homeostasis; National Institute of Dental and Craniofacial Research; National Institutes of Health; Bethesda USA
3. Department of Pathology; Leiden University Medical Center; Leiden The Netherlands
4. Department of Medicine; Division of Endocrinology; Center for Bone Quality; Leiden University Medical Center; Leiden The Netherlands
5. Department of Epidemiology and Department of Medicine, Division of Endocrinology; Leiden University Medical Center; Leiden The Netherlands
6. Department of Epidemiology; Aarhus University Hospital; Aarhus Denmark